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npa-nxx	State	Company	FRN	RMD	OCN	Rate Center	CLLI	Assign Date	Misc
410-236	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	00/00/0000	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
410-249	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	00/00/0000	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-249 is split into 1,000-number blocks - detail below
410-249-0XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-249-1XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-249-2XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-249-3XXX	MD	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	0004999405	RMD0002957	7229	TOWSON	NOCLLIKNOWN	N/A	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
410-249-4XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-249-5XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-249-6XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-249-7XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-249-8XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-249-9XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-252	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	CYVLMDCKDS0	00/00/0000	Prefix Type: RBOC Switch Name: COCKEYSVILLE Switch Type: WECO 5ESS Host (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CYVLMDCKDS0))
410-283	MD	SPOK, INC. (Spok, Inc)	0015608417	RMD0007858	6630	TOWSON	HNVAMDAE3MD	00/00/0000	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: HNVAMDAE3MD))
410-296	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	00/00/0000	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-307	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	00/00/0000	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-307 is split into 1,000-number blocks - detail below
410-307-0XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	09/14/2018	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-307-1XXX	MD	VDL, INC. DBA GLOBAL TELECOM BROKERS - MD	0018511246	RMD0003054	4492	TOWSON	NOCLLIKNOWN	10/17/2003	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
410-307-2XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-307-3XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	11/09/2018	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-307-4XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	11/09/2018	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-307-5XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-307-6XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-307-7XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	11/09/2018	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-307-8XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	09/14/2018	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-307-9XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	05/17/2018	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-308	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	CYVLMDCKDS0	00/00/0000	Prefix Type: RBOC Switch Name: COCKEYSVILLE Switch Type: WECO 5ESS Host (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CYVLMDCKDS0))
410-321	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	00/00/0000	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-324	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	00/00/0000	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-324 is split into 1,000-number blocks - detail below
410-324-0XXX	MD	ONVOY, LLC - MD (Sinch)	0004323028	RMD0001966	876D	TOWSON	NOCLLIKNOWN	01/22/2024	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
410-324-1XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-324-2XXX	MD	BANDWIDTH.COM CLEC, LLC - MD	0017042060	RMD0003709	071F	TOWSON	NOCLLIKNOWN	04/22/2015	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
410-324-3XXX	MD	BANDWIDTH.COM CLEC, LLC - MD	0017042060	RMD0003709	071F	TOWSON	NOCLLIKNOWN	04/22/2015	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
410-324-4XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-324-5XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-324-6XXX	MD	ONVOY, LLC - MD (Sinch)	0004323028	RMD0001966	876D	TOWSON	NOCLLIKNOWN	01/29/2016	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
410-324-7XXX	MD	ONVOY, LLC - MD (Sinch)	0004323028	RMD0001966	876D	TOWSON	NOCLLIKNOWN	02/23/2016	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
410-324-8XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-324-9XXX	MD	BALTIMORE-WASHINGTON TELEPHONE (BWT)	0008104507	RMD0004516	8697	TOWSON	NOCLLIKNOWN	06/23/2015	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
410-337	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	00/00/0000	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-339	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	00/00/0000	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-339 is split into 1,000-number blocks - detail below
410-339-0XXX	MD	ONVOY, LLC - MD (Sinch)	0004323028	RMD0001966	876D	TOWSON	NOCLLIKNOWN	01/22/2024	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
410-339-1XXX	MD	ONVOY, LLC - MD (Sinch)	0004323028	RMD0001966	876D	TOWSON	NOCLLIKNOWN	03/16/2016	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
410-339-2XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	12/11/2018	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-339-3XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-339-4XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-339-5XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-339-6XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-339-7XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-339-8XXX	MD	ONVOY, LLC - MD (Sinch)	0004323028	RMD0001966	876D	TOWSON	NOCLLIKNOWN	01/22/2024	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
410-339-9XXX	MD	TERRA NOVA TELECOM INC.	0021193057	RMD0001495	145J	TOWSON	NOCLLIKNOWN	01/17/2024	Prefix Type: IPES Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
410-372	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	BLTMMDYKRP0	00/00/0000	Prefix Type: RBOC Switch Name: BALTIMORE Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDYKRP0))
410-372 is split into 1,000-number blocks - detail below
410-372-0XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	BLTMMDYKRP0	N/A	Prefix Type: RBOC Switch Name: BALTIMORE Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDYKRP0))
410-372-1XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	BLTMMDYKRP0	N/A	Prefix Type: RBOC Switch Name: BALTIMORE Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDYKRP0))
410-372-2XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	BLTMMDYKRP0	N/A	Prefix Type: RBOC Switch Name: BALTIMORE Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDYKRP0))
410-372-3XXX	MD	COMCAST IP PHONE, LLC (Comcast)	0008497687	RMD0003552	318J	TOWSON	BLTMMDCHXFX	09/15/2015	Prefix Type: IPES Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCHXFX))
410-372-4XXX	MD	LEVEL 3 COMMUNICATIONS, LLC - MD (Lumen Technologies, Inc)	0015338122	RMD0006112	6119	TOWSON	NOCLLIKNOWN	N/A	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
410-372-5XXX	MD	TELEPORT COMMUNICATIONS AMERICA, LLC - MD (AT&T)	0004274114	RMD0003897	7325	TOWSON	NOCLLIKNOWN	11/06/2002	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
410-372-6XXX	MD	PAETEC ITEL, LLC	0015247810	RMD0038378	829J	TOWSON	CLMAMDJTDS0	10/20/2004	Prefix Type: IPES Switch Name: COLUMBIA Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDJTDS0))
410-372-7XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	05/12/2005	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
410-372-8XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	BLTMMDYKRP0	N/A	Prefix Type: RBOC Switch Name: BALTIMORE Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDYKRP0))
410-372-9XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	BLTMMDYKRP0	N/A	Prefix Type: RBOC Switch Name: BALTIMORE Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDYKRP0))
410-373	MD	SPOK, INC. (Spok, Inc)	0015608417	RMD0007858	6630	TOWSON	HNVAMDAE3MD	00/00/0000	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: HNVAMDAE3MD))
410-377	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	BLTMMDYKRP0	00/00/0000	Prefix Type: RBOC Switch Name: BALTIMORE Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDYKRP0))
410-408	MD	SPOK, INC. (Spok, Inc)	0015608417	RMD0007858	6630	TOWSON	HNVAMDAE3MD	00/00/0000	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: HNVAMDAE3MD))
410-427	MD	TELEPORT COMMUNICATIONS AMERICA, LLC - MD (AT&T)	0004274114	RMD0003897	7325	TOWSON	BLTMMDFMDS0	00/00/0000	Prefix Type: CLEC Switch Name: BALTIMORE Switch Type: Northern Telecom DMS100 (Digital) Host LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDFMDS0))
410-434	MD	SPOK, INC. (Spok, Inc)	0015608417	RMD0007858	6630	TOWSON	HNVAMDAE3MD	00/00/0000	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: HNVAMDAE3MD))
410-453	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	CYVLMDCKDS0	00/00/0000	Prefix Type: RBOC Switch Name: COCKEYSVILLE Switch Type: WECO 5ESS Host (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CYVLMDCKDS0))
410-453 is split into 1,000-number blocks - detail below
410-453-0XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	CYVLMDCKDS0	N/A	Prefix Type: RBOC Switch Name: COCKEYSVILLE Switch Type: WECO 5ESS Host (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CYVLMDCKDS0))
410-453-1XXX	MD	ONVOY, LLC - MD (Sinch)	0004323028	RMD0001966	876D	TOWSON	NOCLLIKNOWN	01/22/2024	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
410-453-2XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	12/11/2018	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-453-3XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	12/11/2018	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-453-4XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	CYVLMDCKDS0	N/A	Prefix Type: RBOC Switch Name: COCKEYSVILLE Switch Type: WECO 5ESS Host (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CYVLMDCKDS0))
410-453-5XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	CYVLMDCKDS0	N/A	Prefix Type: RBOC Switch Name: COCKEYSVILLE Switch Type: WECO 5ESS Host (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CYVLMDCKDS0))
410-453-6XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	CYVLMDCKDS0	N/A	Prefix Type: RBOC Switch Name: COCKEYSVILLE Switch Type: WECO 5ESS Host (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CYVLMDCKDS0))
410-453-7XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	12/11/2018	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-453-8XXX	MD	ONVOY, LLC - MD (Sinch)	0004323028	RMD0001966	876D	TOWSON	NOCLLIKNOWN	01/22/2024	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
410-453-9XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	CYVLMDCKDS0	N/A	Prefix Type: RBOC Switch Name: COCKEYSVILLE Switch Type: WECO 5ESS Host (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CYVLMDCKDS0))
410-473	MD	SPOK, INC. (Spok, Inc)	0015608417	RMD0007858	6630	TOWSON	HNVAMDAE3MD	00/00/0000	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: HNVAMDAE3MD))
410-475	MD	SPOK, INC. (Spok, Inc)	0015608417	RMD0007858	6630	TOWSON	HNVAMDAE3MD	00/00/0000	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: HNVAMDAE3MD))
410-492	MD	SPOK, INC. (Spok, Inc)	0015608417	RMD0007858	6630	TOWSON	HNVAMDAE3MD	00/00/0000	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: HNVAMDAE3MD))
410-494	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	00/00/0000	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-512	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	00/00/0000	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-512 is split into 1,000-number blocks - detail below
410-512-0XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-512-1XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-512-2XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-512-3XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-512-4XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-512-5XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-512-6XXX	MD	LEVEL 3 COMMUNICATIONS, LLC - MD (Lumen Technologies, Inc)	0015338122	RMD0006112	6119	TOWSON	NOCLLIKNOWN	06/14/2006	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
410-512-7XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	12/11/2018	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-512-8XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-512-9XXX	MD	ONVOY, LLC - MD (Sinch)	0004323028	RMD0001966	876D	TOWSON	NOCLLIKNOWN	03/14/2024	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
410-560	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	CYVLMDCKDS0	00/00/0000	Prefix Type: RBOC Switch Name: COCKEYSVILLE Switch Type: WECO 5ESS Host (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CYVLMDCKDS0))
410-560 is split into 1,000-number blocks - detail below
410-560-0XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	CYVLMDCKDS0	N/A	Prefix Type: RBOC Switch Name: COCKEYSVILLE Switch Type: WECO 5ESS Host (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CYVLMDCKDS0))
410-560-1XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	CYVLMDCKDS0	N/A	Prefix Type: RBOC Switch Name: COCKEYSVILLE Switch Type: WECO 5ESS Host (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CYVLMDCKDS0))
410-560-2XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	CYVLMDCKDS0	N/A	Prefix Type: RBOC Switch Name: COCKEYSVILLE Switch Type: WECO 5ESS Host (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CYVLMDCKDS0))
410-560-3XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	CYVLMDCKDS0	N/A	Prefix Type: RBOC Switch Name: COCKEYSVILLE Switch Type: WECO 5ESS Host (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CYVLMDCKDS0))
410-560-4XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	CYVLMDCKDS0	N/A	Prefix Type: RBOC Switch Name: COCKEYSVILLE Switch Type: WECO 5ESS Host (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CYVLMDCKDS0))
410-560-5XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	CYVLMDCKDS0	N/A	Prefix Type: RBOC Switch Name: COCKEYSVILLE Switch Type: WECO 5ESS Host (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CYVLMDCKDS0))
410-560-6XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	CYVLMDCKDS0	N/A	Prefix Type: RBOC Switch Name: COCKEYSVILLE Switch Type: WECO 5ESS Host (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CYVLMDCKDS0))
410-560-7XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	CYVLMDCKDS0	N/A	Prefix Type: RBOC Switch Name: COCKEYSVILLE Switch Type: WECO 5ESS Host (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CYVLMDCKDS0))
410-560-8XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	11/07/2025	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-560-9XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	CYVLMDCKDS0	N/A	Prefix Type: RBOC Switch Name: COCKEYSVILLE Switch Type: WECO 5ESS Host (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CYVLMDCKDS0))
410-561	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	CYVLMDCKDS0	00/00/0000	Prefix Type: RBOC Switch Name: COCKEYSVILLE Switch Type: WECO 5ESS Host (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CYVLMDCKDS0))
410-561 is split into 1,000-number blocks - detail below
410-561-0XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	CYVLMDCKDS0	N/A	Prefix Type: RBOC Switch Name: COCKEYSVILLE Switch Type: WECO 5ESS Host (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CYVLMDCKDS0))
410-561-1XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	CYVLMDCKDS0	N/A	Prefix Type: RBOC Switch Name: COCKEYSVILLE Switch Type: WECO 5ESS Host (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CYVLMDCKDS0))
410-561-2XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	CYVLMDCKDS0	N/A	Prefix Type: RBOC Switch Name: COCKEYSVILLE Switch Type: WECO 5ESS Host (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CYVLMDCKDS0))
410-561-3XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	CYVLMDCKDS0	N/A	Prefix Type: RBOC Switch Name: COCKEYSVILLE Switch Type: WECO 5ESS Host (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CYVLMDCKDS0))
410-561-4XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	CYVLMDCKDS0	N/A	Prefix Type: RBOC Switch Name: COCKEYSVILLE Switch Type: WECO 5ESS Host (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CYVLMDCKDS0))
410-561-5XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	CYVLMDCKDS0	N/A	Prefix Type: RBOC Switch Name: COCKEYSVILLE Switch Type: WECO 5ESS Host (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CYVLMDCKDS0))
410-561-6XXX	MD	LEVEL 3 COMMUNICATIONS, LLC - MD (Lumen Technologies, Inc)	0015338122	RMD0006112	6119	TOWSON	NOCLLIKNOWN	11/10/2004	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
410-561-7XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	CYVLMDCKDS0	N/A	Prefix Type: RBOC Switch Name: COCKEYSVILLE Switch Type: WECO 5ESS Host (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CYVLMDCKDS0))
410-561-8XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	CYVLMDCKDS0	N/A	Prefix Type: RBOC Switch Name: COCKEYSVILLE Switch Type: WECO 5ESS Host (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CYVLMDCKDS0))
410-561-9XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	CYVLMDCKDS0	N/A	Prefix Type: RBOC Switch Name: COCKEYSVILLE Switch Type: WECO 5ESS Host (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CYVLMDCKDS0))
410-583	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	00/00/0000	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-583 is split into 1,000-number blocks - detail below
410-583-0XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-583-1XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-583-2XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-583-3XXX	MD	IP HORIZON LLC	0027469766	RMD0001571	515J	TOWSON	NOCLLIKNOWN	03/27/2019	Prefix Type: IPES Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
410-583-4XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-583-5XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-583-6XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-583-7XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-583-8XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-583-9XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-607	MD	SPOK, INC. (Spok, Inc)	0015608417	RMD0007858	6630	TOWSON	HNVAMDAE3MD	00/00/0000	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: HNVAMDAE3MD))
410-616	MD	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD (Verizon Communications)	0004999405	RMD0002957	7228	TOWSON	BLTOMDKHDS0	00/00/0000	Prefix Type: CLEC Switch Name: BALTIMORE Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHDS0))
410-616 is split into 1,000-number blocks - detail below
410-616-0XXX	MD	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD (Verizon Communications)	0004999405	RMD0002957	7228	TOWSON	BLTOMDKHDS0	N/A	Prefix Type: CLEC Switch Name: BALTIMORE Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHDS0))
410-616-1XXX	MD	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD (Verizon Communications)	0004999405	RMD0002957	7228	TOWSON	BLTOMDKHDS0	N/A	Prefix Type: CLEC Switch Name: BALTIMORE Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHDS0))
410-616-2XXX	MD	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD (Verizon Communications)	0004999405	RMD0002957	7228	TOWSON	BLTOMDKHDS0	N/A	Prefix Type: CLEC Switch Name: BALTIMORE Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHDS0))
410-616-3XXX	MD	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD (Verizon Communications)	0004999405	RMD0002957	7228	TOWSON	BLTOMDKHDS0	N/A	Prefix Type: CLEC Switch Name: BALTIMORE Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHDS0))
410-616-4XXX	MD	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD (Verizon Communications)	0004999405	RMD0002957	7228	TOWSON	BLTOMDKHDS0	N/A	Prefix Type: CLEC Switch Name: BALTIMORE Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHDS0))
410-616-5XXX	MD	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD (Verizon Communications)	0004999405	RMD0002957	7228	TOWSON	BLTOMDKHDS0	N/A	Prefix Type: CLEC Switch Name: BALTIMORE Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHDS0))
410-616-6XXX	MD	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD (Verizon Communications)	0004999405	RMD0002957	7228	TOWSON	BLTOMDKHDS0	N/A	Prefix Type: CLEC Switch Name: BALTIMORE Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHDS0))
410-616-7XXX	MD	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD (Verizon Communications)	0004999405	RMD0002957	7228	TOWSON	BLTOMDKHDS0	N/A	Prefix Type: CLEC Switch Name: BALTIMORE Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHDS0))
410-616-8XXX	MD	PAETEC ITEL, LLC	0015247810	RMD0038378	829J	TOWSON	HNVAMDBHAMD	02/03/2003	Prefix Type: IPES Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: HNVAMDBHAMD))
410-616-9XXX	MD	COMCAST IP PHONE, LLC (Comcast)	0008497687	RMD0003552	318J	TOWSON	BLTMMDCHXFX	08/24/2006	Prefix Type: IPES Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCHXFX))
410-681	MD	SPOK, INC. (Spok, Inc)	0015608417	RMD0007858	6630	TOWSON	HNVAMDAE3MD	00/00/0000	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: HNVAMDAE3MD))
410-704	MD	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD (Verizon Communications)	0004999405	RMD0002957	7228	TOWSON	BLTOMDKHDS0	00/00/0000	Prefix Type: CLEC Switch Name: BALTIMORE Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHDS0))
410-716	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	00/00/0000	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-716 is split into 1,000-number blocks - detail below
410-716-0XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-716-1XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-716-2XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-716-3XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-716-4XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	11/09/2018	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-716-5XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	11/09/2018	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-716-6XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	11/09/2018	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-716-7XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-716-8XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	11/07/2025	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-716-9XXX	MD	ONVOY SPECTRUM, LLC (Sinch)	0024415002	RMD0002045	624H	TOWSON	NOCLLIKNOWN	09/24/2024	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
410-769	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	00/00/0000	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-769 is split into 1,000-number blocks - detail below
410-769-0XXX	MD	ONVOY, LLC - MD (Sinch)	0004323028	RMD0001966	876D	TOWSON	NOCLLIKNOWN	03/02/2016	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
410-769-1XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-769-2XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-769-3XXX	MD	ONVOY, LLC - MD (Sinch)	0004323028	RMD0001966	876D	TOWSON	NOCLLIKNOWN	03/02/2016	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
410-769-4XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-769-5XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-769-6XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-769-7XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-769-8XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-769-9XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-790	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	00/00/0000	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
410-806	MD	SPOK, INC. (Spok, Inc)	0015608417	RMD0007858	6630	TOWSON	HNVAMDAE3MD	00/00/0000	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: HNVAMDAE3MD))
410-812	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	00/00/0000	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
410-816	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	00/00/0000	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-816 is split into 1,000-number blocks - detail below
410-816-0XXX	MD	ONVOY SPECTRUM, LLC (Sinch)	0024415002	RMD0002045	624H	TOWSON	NOCLLIKNOWN	09/24/2024	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
410-816-1XXX	MD	BARR TELL USA, INC.	0012167557	RMD0001416	964H	TOWSON	NOCLLIKNOWN	11/18/2016	Prefix Type: UNKNOWN Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
410-816-2XXX	MD	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	0004999405	RMD0002957	7229	TOWSON	NOCLLIKNOWN	N/A	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
410-816-3XXX	MD	LEVEL 3 COMMUNICATIONS, LLC - MD (Lumen Technologies, Inc)	0015338122	RMD0006112	6119	TOWSON	NOCLLIKNOWN	12/05/2018	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
410-816-4XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	05/17/2018	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-816-5XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	05/17/2018	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-816-6XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	05/17/2018	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-816-7XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	05/17/2018	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-816-8XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	05/17/2018	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-816-9XXX	MD	TELNYX LLC	0018998724	RMD0001645	073H	TOWSON	NOCLLIKNOWN	03/02/2017	Prefix Type: IPES Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
410-821	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	00/00/0000	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-823	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	00/00/0000	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-825	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	00/00/0000	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-828	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	00/00/0000	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-830	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	00/00/0000	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-830 is split into 1,000-number blocks - detail below
410-830-0XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	11/02/2004	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-830-1XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	04/06/2005	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-830-2XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-830-3XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-830-4XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-830-5XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-830-6XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-830-7XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-830-8XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-830-9XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	04/06/2005	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-832	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	00/00/0000	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-832 is split into 1,000-number blocks - detail below
410-832-0XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-832-1XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-832-2XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-832-3XXX	MD	COMCAST IP PHONE, LLC (Comcast)	0008497687	RMD0003552	318J	TOWSON	BLTMMDCHXFX	12/20/2016	Prefix Type: IPES Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCHXFX))
410-832-4XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-832-5XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-832-6XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	12/11/2018	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-832-7XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-832-8XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-832-9XXX	MD	ONVOY SPECTRUM, LLC (Sinch)	0024415002	RMD0002045	624H	TOWSON	NOCLLIKNOWN	09/24/2024	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
410-839	MD	SPOK, INC. (Spok, Inc)	0015608417	RMD0007858	6630	TOWSON	HNVAMDAE3MD	00/00/0000	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: HNVAMDAE3MD))
410-842	MD	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD (Verizon Communications)	0004999405	RMD0002957	7228	TOWSON	BLTOMDKHDS0	00/00/0000	Prefix Type: CLEC Switch Name: BALTIMORE Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHDS0))
410-842 is split into 1,000-number blocks - detail below
410-842-0XXX	MD	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD (Verizon Communications)	0004999405	RMD0002957	7228	TOWSON	BLTOMDKHDS0	N/A	Prefix Type: CLEC Switch Name: BALTIMORE Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHDS0))
410-842-1XXX	MD	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD (Verizon Communications)	0004999405	RMD0002957	7228	TOWSON	BLTOMDKHDS0	N/A	Prefix Type: CLEC Switch Name: BALTIMORE Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHDS0))
410-842-2XXX	MD	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD (Verizon Communications)	0004999405	RMD0002957	7228	TOWSON	BLTOMDKHDS0	N/A	Prefix Type: CLEC Switch Name: BALTIMORE Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHDS0))
410-842-3XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	05/12/2005	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
410-842-4XXX	MD	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD (Verizon Communications)	0004999405	RMD0002957	7228	TOWSON	BLTOMDKHDS0	N/A	Prefix Type: CLEC Switch Name: BALTIMORE Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHDS0))
410-842-5XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	05/12/2005	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
410-842-6XXX	MD	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD (Verizon Communications)	0004999405	RMD0002957	7228	TOWSON	BLTOMDKHDS0	N/A	Prefix Type: CLEC Switch Name: BALTIMORE Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHDS0))
410-842-7XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	05/12/2005	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
410-842-8XXX	MD	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD (Verizon Communications)	0004999405	RMD0002957	7228	TOWSON	BLTOMDKHDS0	N/A	Prefix Type: CLEC Switch Name: BALTIMORE Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHDS0))
410-842-9XXX	MD	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD (Verizon Communications)	0004999405	RMD0002957	7228	TOWSON	BLTOMDKHDS0	N/A	Prefix Type: CLEC Switch Name: BALTIMORE Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHDS0))
410-847	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	00/00/0000	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-847 is split into 1,000-number blocks - detail below
410-847-0XXX	MD	ONVOY SPECTRUM, LLC (Sinch)	0024415002	RMD0002045	624H	TOWSON	NOCLLIKNOWN	09/24/2024	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
410-847-1XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-847-2XXX	MD	ONVOY, LLC - MD (Sinch)	0004323028	RMD0001966	876D	TOWSON	NOCLLIKNOWN	01/29/2016	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
410-847-3XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-847-4XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	11/11/2016	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
410-847-5XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	11/11/2016	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
410-847-6XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-847-7XXX	MD	PEERLESS NETWORK OF MARYLAND, LLC		N/A	568G	TOWSON	NOCLLIKNOWN	02/26/2019	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
410-847-8XXX	MD	TERRA NOVA TELECOM INC.	0021193057	RMD0001495	145J	TOWSON	NOCLLIKNOWN	07/01/2025	Prefix Type: IPES Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
410-847-9XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-851	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	BRKLMDBKRP0	00/00/0000	Prefix Type: RBOC Switch Name: BROOKLYN PARK-LINTHICUM Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BRKLMDBKRP0))
410-853	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	00/00/0000	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-853 is split into 1,000-number blocks - detail below
410-853-0XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-853-1XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-853-2XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-853-3XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-853-4XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-853-5XXX	MD	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD (Verizon Communications)	0004999405	RMD0002957	7228	TOWSON	BLTOMDKHDS0	N/A	Prefix Type: CLEC Switch Name: BALTIMORE Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHDS0))
410-853-6XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-853-7XXX	MD	COMCAST IP PHONE, LLC (Comcast)	0008497687	RMD0003552	318J	TOWSON	BLTMMDCHXFX	02/11/2005	Prefix Type: IPES Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCHXFX))
410-853-8XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-853-9XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-887	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	00/00/0000	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-890	MD	SPOK, INC. (Spok, Inc)	0015608417	RMD0007858	6630	TOWSON	HNVAMDAE3MD	00/00/0000	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: HNVAMDAE3MD))
410-894	MD	SPOK, INC. (Spok, Inc)	0015608417	RMD0007858	6630	TOWSON	HNVAMDAE3MD	00/00/0000	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: HNVAMDAE3MD))
410-899	MD	SPOK, INC. (Spok, Inc)	0015608417	RMD0007858	6630	TOWSON	HNVAMDAE3MD	00/00/0000	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: HNVAMDAE3MD))
410-938	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	00/00/0000	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-938 is split into 1,000-number blocks - detail below
410-938-0XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	05/27/2025	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-938-1XXX	MD	OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC (T-Mobile US, Inc)		N/A	6855	TOWSON	BLTMMDCH40Z	11/07/2018	Prefix Type: PCS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCH40Z))
410-938-2XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-938-3XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-938-4XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-938-5XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-938-6XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	12/11/2018	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-938-7XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	12/11/2018	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-938-8XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	N/A	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-938-9XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	05/27/2025	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
410-967	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	00/00/0000	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-269	MD	CORE COMMUNICATIONS, INC.- MD		N/A	2593	TOWSON	BLTMMDCHYMD	00/00/0000	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCHYMD))
443-269 is split into 1,000-number blocks - detail below
443-269-0XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	10/22/2019	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
443-269-1XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	09/14/2018	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
443-269-2XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	12/11/2018	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
443-269-3XXX	MD	CORE COMMUNICATIONS, INC.- MD		N/A	2593	TOWSON	BLTMMDCHYMD	05/23/2018	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCHYMD))
443-269-4XXX	MD	CORE COMMUNICATIONS, INC.- MD		N/A	2593	TOWSON	BLTMMDCHYMD	05/23/2018	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCHYMD))
443-269-5XXX	MD	CORE COMMUNICATIONS, INC.- MD		N/A	2593	TOWSON	BLTMMDCHYMD	05/23/2018	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCHYMD))
443-269-6XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	10/22/2019	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
443-269-7XXX	MD	BANDWIDTH.COM CLEC, LLC - MD	0017042060	RMD0003709	071F	TOWSON	NOCLLIKNOWN	05/30/2018	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
443-269-8XXX	MD	LEVEL 3 COMMUNICATIONS, LLC - MD (Lumen Technologies, Inc)	0015338122	RMD0006112	6119	TOWSON	NOCLLIKNOWN	08/29/2018	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
443-269-9XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	09/14/2018	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
443-275	MD	COMCAST IP PHONE, LLC (Comcast)	0008497687	RMD0003552	318J	TOWSON	BLTMMDCHXFX	00/00/0000	Prefix Type: IPES Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCHXFX))
443-275 is split into 1,000-number blocks - detail below
443-275-0XXX	MD	LEVEL 3 COMMUNICATIONS, LLC - MD (Lumen Technologies, Inc)	0015338122	RMD0006112	6119	TOWSON	NOCLLIKNOWN	12/26/2012	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
443-275-1XXX	MD	COMCAST IP PHONE, LLC (Comcast)	0008497687	RMD0003552	318J	TOWSON	BLTMMDCHXFX	08/24/2006	Prefix Type: IPES Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCHXFX))
443-275-2XXX	MD	COMCAST IP PHONE, LLC (Comcast)	0008497687	RMD0003552	318J	TOWSON	BLTMMDCHXFX	08/01/2007	Prefix Type: IPES Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCHXFX))
443-275-3XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	05/12/2005	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-275-4XXX	MD	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD (Verizon Communications)	0004999405	RMD0002957	7228	TOWSON	BLTOMDKHDS0	N/A	Prefix Type: CLEC Switch Name: BALTIMORE Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHDS0))
443-275-5XXX	MD	LEVEL 3 COMMUNICATIONS, LLC - MD (Lumen Technologies, Inc)	0015338122	RMD0006112	6119	TOWSON	NOCLLIKNOWN	10/27/2010	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
443-275-6XXX	MD	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD (Verizon Communications)	0004999405	RMD0002957	7228	TOWSON	BLTOMDKHDS0	09/17/2012	Prefix Type: CLEC Switch Name: BALTIMORE Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHDS0))
443-275-7XXX	MD	COMCAST IP PHONE, LLC (Comcast)	0008497687	RMD0003552	318J	TOWSON	BLTMMDCHXFX	09/17/2012	Prefix Type: IPES Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCHXFX))
443-275-8XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	01/12/2006	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-275-9XXX	MD	LEVEL 3 COMMUNICATIONS, LLC - MD (Lumen Technologies, Inc)	0015338122	RMD0006112	6119	TOWSON	NOCLLIKNOWN	02/01/2008	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
443-279	MD	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	0004999405	RMD0002957	7229	TOWSON	BLTMMDCHXNX	00/00/0000	Prefix Type: CLEC Switch Name: ROCKVILLE Switch Type: Digital Switching System LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCHXNX))
443-279 is split into 1,000-number blocks - detail below
443-279-0XXX	MD	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	0004999405	RMD0002957	7229	TOWSON	BLTMMDCHXNX	N/A	Prefix Type: CLEC Switch Name: ROCKVILLE Switch Type: Digital Switching System LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCHXNX))
443-279-1XXX	MD	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	0004999405	RMD0002957	7229	TOWSON	BLTMMDCHXNX	N/A	Prefix Type: CLEC Switch Name: ROCKVILLE Switch Type: Digital Switching System LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCHXNX))
443-279-2XXX	MD	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	0004999405	RMD0002957	7229	TOWSON	BLTMMDCHXNX	N/A	Prefix Type: CLEC Switch Name: ROCKVILLE Switch Type: Digital Switching System LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCHXNX))
443-279-3XXX	MD	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	0004999405	RMD0002957	7229	TOWSON	BLTMMDCHXNX	N/A	Prefix Type: CLEC Switch Name: ROCKVILLE Switch Type: Digital Switching System LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCHXNX))
443-279-4XXX	MD	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	0004999405	RMD0002957	7229	TOWSON	BLTMMDCHXNX	N/A	Prefix Type: CLEC Switch Name: ROCKVILLE Switch Type: Digital Switching System LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCHXNX))
443-279-5XXX	MD	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	0004999405	RMD0002957	7229	TOWSON	BLTMMDCHXNX	N/A	Prefix Type: CLEC Switch Name: ROCKVILLE Switch Type: Digital Switching System LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCHXNX))
443-279-6XXX	MD	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	0004999405	RMD0002957	7229	TOWSON	BLTMMDCHXNX	N/A	Prefix Type: CLEC Switch Name: ROCKVILLE Switch Type: Digital Switching System LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCHXNX))
443-279-7XXX	MD	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	0004999405	RMD0002957	7229	TOWSON	BLTMMDCHXNX	N/A	Prefix Type: CLEC Switch Name: ROCKVILLE Switch Type: Digital Switching System LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCHXNX))
443-279-8XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	05/12/2005	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-279-9XXX	MD	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	0004999405	RMD0002957	7229	TOWSON	BLTMMDCHXNX	N/A	Prefix Type: CLEC Switch Name: ROCKVILLE Switch Type: Digital Switching System LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCHXNX))
443-322	MD	PAETEC ITEL, LLC	0015247810	RMD0038378	829J	TOWSON	HNVAMDBHAMD	05/10/2001	Prefix Type: IPES Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: HNVAMDBHAMD))
443-322 is split into 1,000-number blocks - detail below
443-322-0XXX	MD	PAETEC ITEL, LLC	0015247810	RMD0038378	829J	TOWSON	HNVAMDBHAMD	N/A	Prefix Type: IPES Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: HNVAMDBHAMD))
443-322-1XXX	MD	PAETEC ITEL, LLC	0015247810	RMD0038378	829J	TOWSON	HNVAMDBHAMD	N/A	Prefix Type: IPES Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: HNVAMDBHAMD))
443-322-2XXX	MD	PAETEC ITEL, LLC	0015247810	RMD0038378	829J	TOWSON	HNVAMDBHAMD	N/A	Prefix Type: IPES Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: HNVAMDBHAMD))
443-322-3XXX	MD	ONVOY, LLC - MD (Sinch)	0004323028	RMD0001966	876D	TOWSON	NOCLLIKNOWN	05/05/2020	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
443-322-4XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	05/12/2005	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-322-5XXX	MD	PAETEC ITEL, LLC	0015247810	RMD0038378	829J	TOWSON	HNVAMDBHAMD	N/A	Prefix Type: IPES Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: HNVAMDBHAMD))
443-322-6XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	05/12/2005	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-322-7XXX	MD	PAETEC ITEL, LLC	0015247810	RMD0038378	829J	TOWSON	HNVAMDBHAMD	N/A	Prefix Type: IPES Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: HNVAMDBHAMD))
443-322-8XXX	MD	PAETEC ITEL, LLC	0015247810	RMD0038378	829J	TOWSON	HNVAMDBHAMD	N/A	Prefix Type: IPES Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: HNVAMDBHAMD))
443-322-9XXX	MD	PAETEC ITEL, LLC	0015247810	RMD0038378	829J	TOWSON	HNVAMDBHAMD	N/A	Prefix Type: IPES Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: HNVAMDBHAMD))
443-377	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	BLTOMDKHBMD	06/09/2010	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHBMD))
443-377 is split into 1,000-number blocks - detail below
443-377-0XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	BLTOMDKHBMD	06/10/2010	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHBMD))
443-377-1XXX	MD	BANDWIDTH.COM CLEC, LLC - MD	0017042060	RMD0003709	071F	TOWSON	NOCLLIKNOWN	09/28/2010	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
443-377-2XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	BLTOMDKHBMD	01/04/2011	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHBMD))
443-377-3XXX	MD	BANDWIDTH.COM CLEC, LLC - MD	0017042060	RMD0003709	071F	TOWSON	NOCLLIKNOWN	12/07/2010	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
443-377-4XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	BLTOMDKHBMD	01/04/2011	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHBMD))
443-377-5XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	BLTOMDKHBMD	01/04/2011	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHBMD))
443-377-6XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	BLTOMDKHBMD	01/04/2011	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHBMD))
443-377-7XXX	MD	BANDWIDTH.COM CLEC, LLC - MD	0017042060	RMD0003709	071F	TOWSON	NOCLLIKNOWN	02/23/2011	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
443-377-8XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	BLTOMDKHBMD	04/04/2011	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHBMD))
443-377-9XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	BLTOMDKHBMD	04/04/2011	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHBMD))
443-465	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	BLTOMDKHBMD	00/00/0000	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHBMD))
443-465 is split into 1,000-number blocks - detail below
443-465-0XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	BLTOMDKHBMD	N/A	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHBMD))
443-465-1XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	BLTOMDKHBMD	N/A	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHBMD))
443-465-2XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	BLTOMDKHBMD	10/07/2003	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHBMD))
443-465-3XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	BLTOMDKHBMD	10/07/2003	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHBMD))
443-465-4XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	BLTOMDKHBMD	N/A	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHBMD))
443-465-5XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	BLTOMDKHBMD	N/A	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHBMD))
443-465-6XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	BLTOMDKHBMD	N/A	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHBMD))
443-465-7XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	BLTOMDKHBMD	10/07/2003	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHBMD))
443-465-8XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	BLTOMDKHBMD	10/07/2003	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHBMD))
443-465-9XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	BLTOMDKHBMD	10/07/2003	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHBMD))
443-470	MD	PAETEC ITEL, LLC	0015247810	RMD0038378	829J	TOWSON	CLMAMDJTDS0	04/29/2008	Prefix Type: IPES Switch Name: COLUMBIA Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDJTDS0))
443-470 is split into 1,000-number blocks - detail below
443-470-0XXX	MD	OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC (T-Mobile US, Inc)		N/A	6855	TOWSON	BLTMMDCH40Z	07/21/2008	Prefix Type: PCS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCH40Z))
443-470-1XXX	MD	PAETEC ITEL, LLC	0015247810	RMD0038378	829J	TOWSON	CLMAMDJTDS0	05/02/2008	Prefix Type: IPES Switch Name: COLUMBIA Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDJTDS0))
443-470-2XXX	MD	OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC (T-Mobile US, Inc)		N/A	6855	TOWSON	BLTMMDCH40Z	09/24/2008	Prefix Type: PCS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCH40Z))
443-470-3XXX	MD	BANDWIDTH.COM CLEC, LLC - MD	0017042060	RMD0003709	071F	TOWSON	NOCLLIKNOWN	03/30/2010	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
443-470-4XXX	MD	PAETEC ITEL, LLC	0015247810	RMD0038378	829J	TOWSON	CLMAMDJTDS0	05/11/2010	Prefix Type: IPES Switch Name: COLUMBIA Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDJTDS0))
443-470-5XXX	MD	BANDWIDTH.COM CLEC, LLC - MD	0017042060	RMD0003709	071F	TOWSON	NOCLLIKNOWN	05/28/2010	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
443-470-6XXX	MD	BANDWIDTH.COM CLEC, LLC - MD	0017042060	RMD0003709	071F	TOWSON	NOCLLIKNOWN	07/22/2011	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
443-470-7XXX	MD	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD (Verizon Communications)	0004999405	RMD0002957	7228	TOWSON	BLTOMDKHDS0	11/18/2011	Prefix Type: CLEC Switch Name: BALTIMORE Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHDS0))
443-470-8XXX	MD	LEVEL 3 COMMUNICATIONS, LLC - MD (Lumen Technologies, Inc)	0015338122	RMD0006112	6119	TOWSON	NOCLLIKNOWN	08/03/2009	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
443-470-9XXX	MD	BANDWIDTH.COM CLEC, LLC - MD	0017042060	RMD0003709	071F	TOWSON	NOCLLIKNOWN	11/12/2008	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
443-519	MD	LEVEL 3 COMMUNICATIONS, LLC - MD (Lumen Technologies, Inc)	0015338122	RMD0006112	6119	TOWSON	BLTOMDXIDS0	00/00/0000	Prefix Type: CLEC Switch Name: BALTIMORE Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDXIDS0))
443-519 is split into 1,000-number blocks - detail below
443-519-0XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	12/05/2024	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
443-519-1XXX	MD	TERRA NOVA TELECOM INC.	0021193057	RMD0001495	145J	TOWSON	NOCLLIKNOWN	09/16/2024	Prefix Type: IPES Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
443-519-2XXX	MD	LEVEL 3 COMMUNICATIONS, LLC - MD (Lumen Technologies, Inc)	0015338122	RMD0006112	6119	TOWSON	BLTOMDXIDS0	12/16/2004	Prefix Type: CLEC Switch Name: BALTIMORE Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDXIDS0))
443-519-3XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	04/13/2005	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-519-4XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	11/07/2025	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
443-519-5XXX	MD	COMCAST IP PHONE, LLC (Comcast)	0008497687	RMD0003552	318J	TOWSON	BLTMMDCHXFX	04/18/2008	Prefix Type: IPES Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCHXFX))
443-519-6XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	05/12/2005	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-519-7XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	05/12/2005	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-519-8XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	05/12/2005	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-519-9XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	05/12/2005	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-564	MD	LEVEL 3 COMMUNICATIONS, LLC - MD (Lumen Technologies, Inc)	0015338122	RMD0006112	6119	TOWSON	BLTMMDSN6MD	00/00/0000	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDSN6MD))
443-564 is split into 1,000-number blocks - detail below
443-564-0XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	02/10/2004	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-564-1XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	02/10/2004	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-564-2XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	02/10/2004	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-564-3XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	02/10/2004	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-564-4XXX	MD	LEVEL 3 COMMUNICATIONS, LLC - MD (Lumen Technologies, Inc)	0015338122	RMD0006112	6119	TOWSON	BLTMMDSN6MD	N/A	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDSN6MD))
443-564-5XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	02/10/2004	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-564-6XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	02/10/2004	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-564-7XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	02/10/2004	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-564-8XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	11/25/2003	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-564-9XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	11/25/2003	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-608	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	02/27/2009	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-608 is split into 1,000-number blocks - detail below
443-608-0XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	03/04/2009	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-608-1XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	04/08/2011	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-608-2XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	09/29/2011	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
443-608-3XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	09/29/2011	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
443-608-4XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	09/29/2011	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
443-608-5XXX	MD	BANDWIDTH.COM CLEC, LLC - MD	0017042060	RMD0003709	071F	TOWSON	NOCLLIKNOWN	05/04/2011	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
443-608-6XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	09/29/2011	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
443-608-7XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	09/29/2011	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
443-608-8XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	09/29/2011	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
443-608-9XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	09/29/2011	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
443-613	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	02/27/2009	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-613 is split into 1,000-number blocks - detail below
443-613-0XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	03/04/2009	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-613-1XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	06/24/2011	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
443-613-2XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	07/05/2011	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
443-613-3XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	05/24/2011	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
443-613-4XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	07/05/2011	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
443-613-5XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	07/05/2011	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
443-613-6XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	07/05/2011	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
443-613-7XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	07/05/2011	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
443-613-8XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	07/05/2011	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
443-613-9XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	09/29/2011	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
443-632	MD	PAETEC ITEL, LLC	0015247810	RMD0038378	829J	TOWSON	CLMAMDJTDS0	00/00/0000	Prefix Type: IPES Switch Name: COLUMBIA Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDJTDS0))
443-632 is split into 1,000-number blocks - detail below
443-632-0XXX	MD	PAETEC ITEL, LLC	0015247810	RMD0038378	829J	TOWSON	CLMAMDJTDS0	N/A	Prefix Type: IPES Switch Name: COLUMBIA Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDJTDS0))
443-632-1XXX	MD	PAETEC ITEL, LLC	0015247810	RMD0038378	829J	TOWSON	CLMAMDJTDS0	N/A	Prefix Type: IPES Switch Name: COLUMBIA Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDJTDS0))
443-632-2XXX	MD	PAETEC ITEL, LLC	0015247810	RMD0038378	829J	TOWSON	CLMAMDJTDS0	N/A	Prefix Type: IPES Switch Name: COLUMBIA Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDJTDS0))
443-632-3XXX	MD	PAETEC ITEL, LLC	0015247810	RMD0038378	829J	TOWSON	CLMAMDJTDS0	N/A	Prefix Type: IPES Switch Name: COLUMBIA Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDJTDS0))
443-632-4XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	03/03/2005	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
443-632-5XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	05/04/2005	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
443-632-6XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	01/05/2005	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
443-632-7XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	01/05/2005	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
443-632-8XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	08/02/2005	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
443-632-9XXX	MD	PAETEC ITEL, LLC	0015247810	RMD0038378	829J	TOWSON	CLMAMDJTDS0	N/A	Prefix Type: IPES Switch Name: COLUMBIA Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDJTDS0))
443-652	MD	OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC (T-Mobile US, Inc)		N/A	6855	TOWSON	BLTMMDCH40Z	00/00/0000	Prefix Type: PCS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCH40Z))
443-652 is split into 1,000-number blocks - detail below
443-652-0XXX	MD	OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC (T-Mobile US, Inc)		N/A	6855	TOWSON	BLTMMDCH40Z	06/16/2016	Prefix Type: PCS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCH40Z))
443-652-1XXX	MD	ONVOY, LLC - MD (Sinch)	0004323028	RMD0001966	876D	TOWSON	NOCLLIKNOWN	10/11/2024	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
443-652-2XXX	MD	OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC (T-Mobile US, Inc)		N/A	6855	TOWSON	BLTMMDCH40Z	05/17/2007	Prefix Type: PCS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCH40Z))
443-652-3XXX	MD	COMCAST IP PHONE, LLC (Comcast)	0008497687	RMD0003552	318J	TOWSON	BLTMMDCHXFX	04/27/2016	Prefix Type: IPES Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCHXFX))
443-652-4XXX	MD	BANDWIDTH.COM CLEC, LLC - MD	0017042060	RMD0003709	071F	TOWSON	NOCLLIKNOWN	06/21/2016	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
443-652-5XXX	MD	PAETEC ITEL, LLC	0015247810	RMD0038378	829J	TOWSON	HNVAMDBHAMD	06/21/2016	Prefix Type: IPES Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: HNVAMDBHAMD))
443-652-6XXX	MD	LEVEL 3 COMMUNICATIONS, LLC - MD (Lumen Technologies, Inc)	0015338122	RMD0006112	6119	TOWSON	NOCLLIKNOWN	06/28/2016	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
443-652-7XXX	MD	OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC (T-Mobile US, Inc)		N/A	6855	TOWSON	BLTMMDCH40Z	08/22/2018	Prefix Type: PCS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCH40Z))
443-652-8XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	09/14/2018	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
443-652-9XXX	MD	IP HORIZON LLC	0027469766	RMD0001571	515J	TOWSON	NOCLLIKNOWN	09/15/2016	Prefix Type: IPES Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
443-761	MD	OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC (T-Mobile US, Inc)		N/A	6855	TOWSON	BLTMMDCH40Z	05/28/2008	Prefix Type: PCS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCH40Z))
443-761 is split into 1,000-number blocks - detail below
443-761-0XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	06/03/2010	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
443-761-1XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	03/04/2010	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
443-761-2XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	06/03/2010	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
443-761-3XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	06/15/2011	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
443-761-4XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	06/15/2011	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
443-761-5XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	06/15/2011	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
443-761-6XXX	MD	PAETEC ITEL, LLC	0015247810	RMD0038378	829J	TOWSON	HNVAMDBHAMD	08/21/2008	Prefix Type: IPES Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: HNVAMDBHAMD))
443-761-7XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	09/29/2011	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
443-761-8XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	07/02/2010	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
443-761-9XXX	MD	OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC (T-Mobile US, Inc)		N/A	6855	TOWSON	BLTMMDCH40Z	05/29/2008	Prefix Type: PCS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCH40Z))
443-791	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	00/00/0000	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-791 is split into 1,000-number blocks - detail below
443-791-0XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	N/A	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-791-1XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	N/A	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-791-2XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	N/A	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-791-3XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	08/25/2003	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-791-4XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	N/A	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-791-5XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	08/21/2003	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-791-6XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	08/21/2003	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-791-7XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	08/21/2003	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-791-8XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	05/12/2006	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
443-791-9XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	N/A	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-797	MD	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	0004999405	RMD0002957	7229	TOWSON	BLTMMDCHXNX	00/00/0000	Prefix Type: CLEC Switch Name: ROCKVILLE Switch Type: Digital Switching System LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCHXNX))
443-797 is split into 1,000-number blocks - detail below
443-797-0XXX	MD	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	0004999405	RMD0002957	7229	TOWSON	BLTMMDCHXNX	N/A	Prefix Type: CLEC Switch Name: ROCKVILLE Switch Type: Digital Switching System LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCHXNX))
443-797-1XXX	MD	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	0004999405	RMD0002957	7229	TOWSON	BLTMMDCHXNX	N/A	Prefix Type: CLEC Switch Name: ROCKVILLE Switch Type: Digital Switching System LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCHXNX))
443-797-2XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	08/05/2004	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
443-797-3XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	08/05/2004	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
443-797-4XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	05/12/2005	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-797-5XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	05/12/2005	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-797-6XXX	MD	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	0004999405	RMD0002957	7229	TOWSON	BLTMMDCHXNX	07/19/2005	Prefix Type: CLEC Switch Name: ROCKVILLE Switch Type: Digital Switching System LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCHXNX))
443-797-7XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	06/04/2004	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
443-797-8XXX	MD	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	0004999405	RMD0002957	7229	TOWSON	BLTMMDCHXNX	N/A	Prefix Type: CLEC Switch Name: ROCKVILLE Switch Type: Digital Switching System LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCHXNX))
443-797-9XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	03/06/2006	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
443-798	MD	LEVEL 3 TELECOM OF MARYLAND, LLC - MD (Lumen Technologies, Inc)	0017348202	RMD0006082	7591	TOWSON	BLTMMDDNDS2	00/00/0000	Prefix Type: CLEC Switch Name: BALTIMORE Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDDNDS2))
443-798 is split into 1,000-number blocks - detail below
443-798-0XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	02/10/2004	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-798-1XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	02/10/2004	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-798-2XXX	MD	LEVEL 3 COMMUNICATIONS, LLC - MD (Lumen Technologies, Inc)	0015338122	RMD0006112	6119	TOWSON	NOCLLIKNOWN	07/17/2007	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
443-798-3XXX	MD	LEVEL 3 COMMUNICATIONS, LLC - MD (Lumen Technologies, Inc)	0015338122	RMD0006112	6119	TOWSON	NOCLLIKNOWN	03/14/2006	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
443-798-4XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	04/19/2006	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-798-5XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	04/19/2006	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-798-6XXX	MD	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	0004999405	RMD0002957	7229	TOWSON	BLTMMDCHXNX	07/19/2005	Prefix Type: CLEC Switch Name: ROCKVILLE Switch Type: Digital Switching System LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCHXNX))
443-798-7XXX	MD	PAETEC ITEL, LLC	0015247810	RMD0038378	829J	TOWSON	CLMAMDJTDS0	08/14/2007	Prefix Type: IPES Switch Name: COLUMBIA Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDJTDS0))
443-798-8XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	02/10/2004	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-798-9XXX	MD	LEVEL 3 TELECOM OF MARYLAND, LLC - MD (Lumen Technologies, Inc)	0017348202	RMD0006082	7591	TOWSON	BLTMMDDNDS2	N/A	Prefix Type: CLEC Switch Name: BALTIMORE Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDDNDS2))
443-809	MD	LEVEL 3 COMMUNICATIONS, LLC - MD (Lumen Technologies, Inc)	0015338122	RMD0006112	6119	TOWSON	BLTMMDSN6MD	06/13/2014	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDSN6MD))
443-809 is split into 1,000-number blocks - detail below
443-809-0XXX	MD	LEVEL 3 COMMUNICATIONS, LLC - MD (Lumen Technologies, Inc)	0015338122	RMD0006112	6119	TOWSON	BLTMMDSN6MD	06/16/2014	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDSN6MD))
443-809-1XXX	MD	LEVEL 3 COMMUNICATIONS, LLC - MD (Lumen Technologies, Inc)	0015338122	RMD0006112	6119	TOWSON	BLTMMDSN6MD	06/16/2014	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDSN6MD))
443-809-2XXX	MD	LEVEL 3 COMMUNICATIONS, LLC - MD (Lumen Technologies, Inc)	0015338122	RMD0006112	6119	TOWSON	BLTMMDSN6MD	06/16/2014	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDSN6MD))
443-809-3XXX	MD	LEVEL 3 COMMUNICATIONS, LLC - MD (Lumen Technologies, Inc)	0015338122	RMD0006112	6119	TOWSON	BLTMMDSN6MD	06/16/2014	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDSN6MD))
443-809-4XXX	MD	LEVEL 3 COMMUNICATIONS, LLC - MD (Lumen Technologies, Inc)	0015338122	RMD0006112	6119	TOWSON	BLTMMDSN6MD	06/16/2014	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDSN6MD))
443-809-5XXX	MD	LEVEL 3 COMMUNICATIONS, LLC - MD (Lumen Technologies, Inc)	0015338122	RMD0006112	6119	TOWSON	BLTMMDSN6MD	06/16/2014	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDSN6MD))
443-809-6XXX	MD	LEVEL 3 COMMUNICATIONS, LLC - MD (Lumen Technologies, Inc)	0015338122	RMD0006112	6119	TOWSON	BLTMMDSN6MD	06/16/2014	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDSN6MD))
443-809-7XXX	MD	LEVEL 3 COMMUNICATIONS, LLC - MD (Lumen Technologies, Inc)	0015338122	RMD0006112	6119	TOWSON	BLTMMDSN6MD	06/16/2014	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDSN6MD))
443-809-8XXX	MD	LEVEL 3 COMMUNICATIONS, LLC - MD (Lumen Technologies, Inc)	0015338122	RMD0006112	6119	TOWSON	BLTMMDSN6MD	06/16/2014	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDSN6MD))
443-809-9XXX	MD	LEVEL 3 COMMUNICATIONS, LLC - MD (Lumen Technologies, Inc)	0015338122	RMD0006112	6119	TOWSON	BLTMMDSN6MD	06/16/2014	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDSN6MD))
443-823	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	BLTOMDKHBMD	07/13/2006	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHBMD))
443-823 is split into 1,000-number blocks - detail below
443-823-0XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	BLTOMDKHBMD	07/17/2006	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHBMD))
443-823-1XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	BLTOMDKHBMD	10/04/2006	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHBMD))
443-823-2XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	11/01/2006	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-823-3XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	11/01/2006	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-823-4XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	11/01/2006	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-823-5XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	11/01/2006	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-823-6XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	11/01/2006	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-823-7XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	02/08/2008	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-823-8XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	02/08/2008	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-823-9XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	BLTOMDKHBMD	12/05/2006	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHBMD))
443-824	MD	OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC (T-Mobile US, Inc)		N/A	6855	TOWSON	BLTMMDCHXWY	05/18/2001	Prefix Type: PCS Switch Name: BALTIMORE Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCHXWY))
443-824 is split into 1,000-number blocks - detail below
443-824-0XXX	MD	OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC (T-Mobile US, Inc)		N/A	6855	TOWSON	BLTMMDCHXWY	N/A	Prefix Type: PCS Switch Name: BALTIMORE Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCHXWY))
443-824-1XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	07/21/2006	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-824-2XXX	MD	OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC (T-Mobile US, Inc)		N/A	6855	TOWSON	BLTMMDCHXWY	N/A	Prefix Type: PCS Switch Name: BALTIMORE Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCHXWY))
443-824-3XXX	MD	OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC (T-Mobile US, Inc)		N/A	6855	TOWSON	BLTMMDCHXWY	N/A	Prefix Type: PCS Switch Name: BALTIMORE Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCHXWY))
443-824-4XXX	MD	OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC (T-Mobile US, Inc)		N/A	6855	TOWSON	BLTMMDCHXWY	N/A	Prefix Type: PCS Switch Name: BALTIMORE Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCHXWY))
443-824-5XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	07/21/2006	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-824-6XXX	MD	OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC (T-Mobile US, Inc)		N/A	6855	TOWSON	BLTMMDCHXWY	N/A	Prefix Type: PCS Switch Name: BALTIMORE Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCHXWY))
443-824-7XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	07/21/2006	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-824-8XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	07/21/2006	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-824-9XXX	MD	OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC (T-Mobile US, Inc)		N/A	6855	TOWSON	BLTMMDCHXWY	N/A	Prefix Type: PCS Switch Name: BALTIMORE Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCHXWY))
443-834	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	WDLWMDEMCM3	00/00/0000	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: WDLWMDEMCM3))
443-834 is split into 1,000-number blocks - detail below
443-834-0XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	04/19/2006	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-834-1XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	08/06/2020	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-834-2XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	WDLWMDEMCM3	11/02/2004	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: WDLWMDEMCM3))
443-834-3XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	WDLWMDEMCM3	04/05/2004	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: WDLWMDEMCM3))
443-834-4XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	WDLWMDEMCM3	03/01/2004	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: WDLWMDEMCM3))
443-834-5XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	WDLWMDEMCM3	09/07/2005	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: WDLWMDEMCM3))
443-834-6XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	WDLWMDEMCM3	03/06/2006	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: WDLWMDEMCM3))
443-834-7XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	WDLWMDEMCM3	12/05/2024	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: WDLWMDEMCM3))
443-834-8XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	WDLWMDEMCM3	07/07/2005	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: WDLWMDEMCM3))
443-834-9XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	WDLWMDEMCM3	07/07/2005	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: WDLWMDEMCM3))
443-841	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	CYVLMDCKDS0	00/00/0000	Prefix Type: RBOC Switch Name: COCKEYSVILLE Switch Type: WECO 5ESS Host (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CYVLMDCKDS0))
443-841 is split into 1,000-number blocks - detail below
443-841-0XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	03/06/2006	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
443-841-1XXX	MD	PAETEC ITEL, LLC	0015247810	RMD0038378	829J	TOWSON	HNVAMDBHAMD	02/10/2005	Prefix Type: IPES Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: HNVAMDBHAMD))
443-841-2XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	03/06/2006	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
443-841-3XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	CYVLMDCKDS0	N/A	Prefix Type: RBOC Switch Name: COCKEYSVILLE Switch Type: WECO 5ESS Host (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CYVLMDCKDS0))
443-841-4XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	12/05/2005	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
443-841-5XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	12/05/2005	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
443-841-6XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	12/05/2005	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
443-841-7XXX	MD	COMCAST IP PHONE, LLC (Comcast)	0008497687	RMD0003552	318J	TOWSON	BLTMMDCHXFX	11/01/2005	Prefix Type: IPES Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCHXFX))
443-841-8XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	04/19/2006	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-841-9XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	12/05/2005	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
443-846	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	00/00/0000	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-846 is split into 1,000-number blocks - detail below
443-846-0XXX	MD	BANDWIDTH.COM CLEC, LLC - MD	0017042060	RMD0003709	071F	TOWSON	NOCLLIKNOWN	08/15/2013	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
443-846-1XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	01/18/2005	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-846-2XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	01/18/2005	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-846-3XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	01/18/2005	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-846-4XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	01/18/2005	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-846-5XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	01/18/2005	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-846-6XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	01/18/2005	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-846-7XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	01/18/2005	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-846-8XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	01/18/2005	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-846-9XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	01/18/2005	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-847	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	BLTOMDKHBMD	10/12/2006	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHBMD))
443-847 is split into 1,000-number blocks - detail below
443-847-0XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	BLTOMDKHBMD	10/17/2006	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHBMD))
443-847-1XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	BLTOMDKHBMD	01/04/2007	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHBMD))
443-847-2XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	02/07/2007	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-847-3XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	02/07/2007	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-847-4XXX	MD	OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC (T-Mobile US, Inc)		N/A	6855	TOWSON	BLTMMDCH40Z	02/13/2007	Prefix Type: PCS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCH40Z))
443-847-5XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	04/30/2007	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-847-6XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	04/30/2007	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-847-7XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	04/30/2007	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-847-8XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	04/30/2007	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-847-9XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	04/30/2007	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-849	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	TOWSON	TWSNMDTWDS0	05/18/2001	Prefix Type: RBOC Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
443-862	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	BLTOMDKHBMD	10/07/2011	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHBMD))
443-862 is split into 1,000-number blocks - detail below
443-862-0XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	BLTOMDKHBMD	10/07/2011	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHBMD))
443-862-1XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	BLTOMDKHBMD	10/07/2011	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHBMD))
443-862-2XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	BLTOMDKHBMD	11/09/2011	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHBMD))
443-862-3XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	BLTOMDKHBMD	11/09/2011	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHBMD))
443-862-4XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	BLTOMDKHBMD	11/09/2011	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHBMD))
443-862-5XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	BLTOMDKHBMD	11/09/2011	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHBMD))
443-862-6XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	BLTOMDKHBMD	11/09/2011	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHBMD))
443-862-7XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	BLTOMDKHBMD	06/25/2012	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHBMD))
443-862-8XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	BLTOMDKHBMD	06/25/2012	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHBMD))
443-862-9XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	BLTOMDKHBMD	06/25/2012	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHBMD))
443-895	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	BLTOMDKHBMD	04/09/2007	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHBMD))
443-895 is split into 1,000-number blocks - detail below
443-895-0XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	BLTOMDKHBMD	04/12/2007	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHBMD))
443-895-1XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	BLTOMDKHBMD	04/12/2007	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHBMD))
443-895-2XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	07/25/2007	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-895-3XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	07/25/2007	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-895-4XXX	MD	COMCAST IP PHONE, LLC (Comcast)	0008497687	RMD0003552	318J	TOWSON	BLTMMDCHXFX	07/18/2007	Prefix Type: IPES Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCHXFX))
443-895-5XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	07/25/2007	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-895-6XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	07/25/2007	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-895-7XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	07/25/2007	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-895-8XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	07/25/2007	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-895-9XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	07/25/2007	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-900	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	BLTOMDKHBMD	05/23/2012	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHBMD))
443-900 is split into 1,000-number blocks - detail below
443-900-0XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	BLTOMDKHBMD	05/23/2012	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHBMD))
443-900-1XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	BLTOMDKHBMD	05/23/2012	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHBMD))
443-900-2XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	BLTOMDKHBMD	05/23/2012	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHBMD))
443-900-3XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	BLTOMDKHBMD	05/23/2012	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHBMD))
443-900-4XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	BLTOMDKHBMD	05/23/2012	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHBMD))
443-900-5XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	BLTOMDKHBMD	05/23/2012	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHBMD))
443-900-6XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	BLTOMDKHBMD	06/05/2012	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHBMD))
443-900-7XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	BLTOMDKHBMD	06/05/2012	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHBMD))
443-900-8XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	BLTOMDKHBMD	06/05/2012	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHBMD))
443-900-9XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	BLTOMDKHBMD	06/25/2012	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHBMD))
443-901	MD	PAETEC ITEL, LLC	0015247810	RMD0038378	829J	TOWSON	HNVAMDBHAMD	08/21/2001	Prefix Type: IPES Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: HNVAMDBHAMD))
443-901 is split into 1,000-number blocks - detail below
443-901-0XXX	MD	PAETEC ITEL, LLC	0015247810	RMD0038378	829J	TOWSON	HNVAMDBHAMD	N/A	Prefix Type: IPES Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: HNVAMDBHAMD))
443-901-1XXX	MD	PAETEC ITEL, LLC	0015247810	RMD0038378	829J	TOWSON	HNVAMDBHAMD	N/A	Prefix Type: IPES Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: HNVAMDBHAMD))
443-901-2XXX	MD	PAETEC ITEL, LLC	0015247810	RMD0038378	829J	TOWSON	HNVAMDBHAMD	N/A	Prefix Type: IPES Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: HNVAMDBHAMD))
443-901-3XXX	MD	ONVOY, LLC - MD (Sinch)	0004323028	RMD0001966	876D	TOWSON	NOCLLIKNOWN	07/14/2020	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
443-901-4XXX	MD	ONVOY, LLC - MD (Sinch)	0004323028	RMD0001966	876D	TOWSON	NOCLLIKNOWN	07/14/2020	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
443-901-5XXX	MD	ONVOY, LLC - MD (Sinch)	0004323028	RMD0001966	876D	TOWSON	NOCLLIKNOWN	07/14/2020	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
443-901-6XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	06/18/2020	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
443-901-7XXX	MD	PAETEC ITEL, LLC	0015247810	RMD0038378	829J	TOWSON	HNVAMDBHAMD	N/A	Prefix Type: IPES Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: HNVAMDBHAMD))
443-901-8XXX	MD	OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC (T-Mobile US, Inc)		N/A	6855	TOWSON	BLTMMDCH40Z	04/15/2021	Prefix Type: PCS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCH40Z))
443-901-9XXX	MD	PAETEC ITEL, LLC	0015247810	RMD0038378	829J	TOWSON	HNVAMDBHAMD	N/A	Prefix Type: IPES Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: HNVAMDBHAMD))
443-912	MD	CORE COMMUNICATIONS, INC.- MD		N/A	2593	TOWSON	BLTMMD91DS1	07/02/2002	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMD91DS1))
443-912 is split into 1,000-number blocks - detail below
443-912-0XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	04/13/2005	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-912-1XXX	MD	CORE COMMUNICATIONS, INC.- MD		N/A	2593	TOWSON	BLTMMD91DS1	07/15/2002	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMD91DS1))
443-912-2XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	02/08/2006	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-912-3XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	02/08/2006	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-912-4XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	02/08/2006	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-912-5XXX	MD	ONVOY, LLC - MD (Sinch)	0004323028	RMD0001966	876D	TOWSON	NOCLLIKNOWN	07/14/2015	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
443-912-6XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	02/28/2008	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-912-7XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	02/17/2006	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-912-8XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	02/17/2006	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-912-9XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	02/17/2006	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-921	MD	PAETEC ITEL, LLC	0015247810	RMD0038378	829J	TOWSON	BLTMMDCHW29	00/00/0000	Prefix Type: IPES Switch Name: BALTIMORE Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCHW29))
443-921 is split into 1,000-number blocks - detail below
443-921-0XXX	MD	PAETEC ITEL, LLC	0015247810	RMD0038378	829J	TOWSON	BLTMMDCHW29	N/A	Prefix Type: IPES Switch Name: BALTIMORE Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCHW29))
443-921-1XXX	MD	PAETEC ITEL, LLC	0015247810	RMD0038378	829J	TOWSON	BLTMMDCHW29	N/A	Prefix Type: IPES Switch Name: BALTIMORE Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCHW29))
443-921-2XXX	MD	PAETEC ITEL, LLC	0015247810	RMD0038378	829J	TOWSON	BLTMMDCHW29	N/A	Prefix Type: IPES Switch Name: BALTIMORE Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCHW29))
443-921-3XXX	MD	PAETEC ITEL, LLC	0015247810	RMD0038378	829J	TOWSON	BLTMMDCHW29	N/A	Prefix Type: IPES Switch Name: BALTIMORE Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCHW29))
443-921-4XXX	MD	PAETEC ITEL, LLC	0015247810	RMD0038378	829J	TOWSON	BLTMMDCHW29	N/A	Prefix Type: IPES Switch Name: BALTIMORE Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCHW29))
443-921-5XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	02/17/2006	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-921-6XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	02/17/2006	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-921-7XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	02/17/2006	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-921-8XXX	MD	PAETEC ITEL, LLC	0015247810	RMD0038378	829J	TOWSON	BLTMMDCHW29	N/A	Prefix Type: IPES Switch Name: BALTIMORE Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCHW29))
443-921-9XXX	MD	PAETEC ITEL, LLC	0015247810	RMD0038378	829J	TOWSON	BLTMMDCHW29	N/A	Prefix Type: IPES Switch Name: BALTIMORE Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCHW29))
443-935	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	07/31/2006	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-935 is split into 1,000-number blocks - detail below
443-935-0XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	08/04/2006	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-935-1XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	08/04/2006	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-935-2XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	08/29/2006	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-935-3XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	08/29/2006	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-935-4XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	08/29/2006	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-935-5XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	09/14/2016	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-935-6XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	09/14/2016	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-935-7XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	11/11/2016	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-935-8XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	02/07/2007	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-935-9XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	02/07/2007	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-991	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	BLTOMDKHBMD	12/01/2011	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHBMD))
443-991 is split into 1,000-number blocks - detail below
443-991-0XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	BLTOMDKHBMD	10/23/2012	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHBMD))
443-991-1XXX	MD	METROPCS, INC. (T-Mobile US, Inc)		N/A	5562	TOWSON	BLTMMDCHFMD	05/22/2013	Prefix Type: PCS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCHFMD))
443-991-2XXX	MD	METROPCS, INC. (T-Mobile US, Inc)		N/A	5562	TOWSON	BLTMMDCHFMD	05/22/2013	Prefix Type: PCS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCHFMD))
443-991-3XXX	MD	METROPCS, INC. (T-Mobile US, Inc)		N/A	5562	TOWSON	BLTMMDCHFMD	05/22/2013	Prefix Type: PCS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCHFMD))
443-991-4XXX	MD	COMCAST IP PHONE, LLC (Comcast)	0008497687	RMD0003552	318J	TOWSON	BLTMMDCHXFX	01/31/2014	Prefix Type: IPES Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCHXFX))
443-991-5XXX	MD	COMCAST IP PHONE, LLC (Comcast)	0008497687	RMD0003552	318J	TOWSON	BLTMMDCHXFX	04/02/2015	Prefix Type: IPES Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCHXFX))
443-991-6XXX	MD	METROPCS, INC. (T-Mobile US, Inc)		N/A	5562	TOWSON	BLTMMDCHFMD	07/02/2013	Prefix Type: PCS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCHFMD))
443-991-7XXX	MD	LEVEL 3 COMMUNICATIONS, LLC - MD (Lumen Technologies, Inc)	0015338122	RMD0006112	6119	TOWSON	NOCLLIKNOWN	02/03/2012	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
443-991-8XXX	MD	ONVOY, LLC - MD (Sinch)	0004323028	RMD0001966	876D	TOWSON	NOCLLIKNOWN	02/06/2012	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
443-991-9XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	BLTOMDKHBMD	06/25/2012	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHBMD))
667-206	MD	METROPCS, INC. (T-Mobile US, Inc)		N/A	5562	TOWSON	BLTMMDCHFMD	07/16/2013	Prefix Type: PCS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCHFMD))
667-206 is split into 1,000-number blocks - detail below
667-206-0XXX	MD	OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC (T-Mobile US, Inc)		N/A	6855	TOWSON	BLTMMDCH40Z	08/23/2013	Prefix Type: PCS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCH40Z))
667-206-1XXX	MD	PEERLESS NETWORK OF MARYLAND, LLC		N/A	568G	TOWSON	NOCLLIKNOWN	09/21/2015	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
667-206-2XXX	MD	COMCAST IP PHONE, LLC (Comcast)	0008497687	RMD0003552	318J	TOWSON	BLTMMDCHXFX	11/08/2016	Prefix Type: IPES Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCHXFX))
667-206-3XXX	MD	ONVOY, LLC - MD (Sinch)	0004323028	RMD0001966	876D	TOWSON	NOCLLIKNOWN	12/14/2015	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
667-206-4XXX	MD	COMCAST IP PHONE, LLC (Comcast)	0008497687	RMD0003552	318J	TOWSON	BLTMMDCHXFX	08/07/2014	Prefix Type: IPES Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCHXFX))
667-206-5XXX	MD	ONVOY, LLC - MD (Sinch)	0004323028	RMD0001966	876D	TOWSON	NOCLLIKNOWN	09/24/2014	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
667-206-6XXX	MD	ONVOY, LLC - MD (Sinch)	0004323028	RMD0001966	876D	TOWSON	NOCLLIKNOWN	09/24/2014	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
667-206-7XXX	MD	IP HORIZON LLC	0027469766	RMD0001571	515J	TOWSON	NOCLLIKNOWN	12/07/2015	Prefix Type: IPES Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
667-206-8XXX	MD	OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC (T-Mobile US, Inc)		N/A	6855	TOWSON	BLTMMDCH40Z	11/27/2013	Prefix Type: PCS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCH40Z))
667-206-9XXX	MD	METROPCS, INC. (T-Mobile US, Inc)		N/A	5562	TOWSON	BLTMMDCHFMD	07/19/2013	Prefix Type: PCS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCHFMD))
667-251	MD	LEVEL 3 COMMUNICATIONS, LLC - MD (Lumen Technologies, Inc)	0015338122	RMD0006112	6119	TOWSON	BLTMMDSN6MD	12/24/2014	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDSN6MD))
667-251 is split into 1,000-number blocks - detail below
667-251-0XXX	MD	LEVEL 3 COMMUNICATIONS, LLC - MD (Lumen Technologies, Inc)	0015338122	RMD0006112	6119	TOWSON	BLTMMDSN6MD	12/29/2014	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDSN6MD))
667-251-1XXX	MD	LEVEL 3 COMMUNICATIONS, LLC - MD (Lumen Technologies, Inc)	0015338122	RMD0006112	6119	TOWSON	BLTMMDSN6MD	12/29/2014	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDSN6MD))
667-251-2XXX	MD	LEVEL 3 COMMUNICATIONS, LLC - MD (Lumen Technologies, Inc)	0015338122	RMD0006112	6119	TOWSON	BLTMMDSN6MD	12/29/2014	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDSN6MD))
667-251-3XXX	MD	LEVEL 3 COMMUNICATIONS, LLC - MD (Lumen Technologies, Inc)	0015338122	RMD0006112	6119	TOWSON	BLTMMDSN6MD	12/29/2014	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDSN6MD))
667-251-4XXX	MD	LEVEL 3 COMMUNICATIONS, LLC - MD (Lumen Technologies, Inc)	0015338122	RMD0006112	6119	TOWSON	BLTMMDSN6MD	12/29/2014	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDSN6MD))
667-251-5XXX	MD	LEVEL 3 COMMUNICATIONS, LLC - MD (Lumen Technologies, Inc)	0015338122	RMD0006112	6119	TOWSON	BLTMMDSN6MD	12/29/2014	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDSN6MD))
667-251-6XXX	MD	LEVEL 3 COMMUNICATIONS, LLC - MD (Lumen Technologies, Inc)	0015338122	RMD0006112	6119	TOWSON	BLTMMDSN6MD	12/29/2014	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDSN6MD))
667-251-7XXX	MD	LEVEL 3 COMMUNICATIONS, LLC - MD (Lumen Technologies, Inc)	0015338122	RMD0006112	6119	TOWSON	BLTMMDSN6MD	12/29/2014	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDSN6MD))
667-251-8XXX	MD	LEVEL 3 COMMUNICATIONS, LLC - MD (Lumen Technologies, Inc)	0015338122	RMD0006112	6119	TOWSON	BLTMMDSN6MD	12/29/2014	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDSN6MD))
667-251-9XXX	MD	LEVEL 3 COMMUNICATIONS, LLC - MD (Lumen Technologies, Inc)	0015338122	RMD0006112	6119	TOWSON	BLTMMDSN6MD	12/29/2014	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDSN6MD))
667-275	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	BLTOMDKHBMD	11/01/2019	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHBMD))
667-275 is split into 1,000-number blocks - detail below
667-275-0XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	BLTOMDKHBMD	11/01/2019	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHBMD))
667-275-1XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	BLTOMDKHBMD	11/01/2019	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHBMD))
667-275-2XXX	MD	TON80 COMMUNICATIONS, LLC	0025462672	RMD0005819	516J	TOWSON	NOCLLIKNOWN	06/04/2021	Prefix Type: IPES Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
667-275-3XXX	MD	ONVOY, LLC - MD (Sinch)	0004323028	RMD0001966	876D	TOWSON	NOCLLIKNOWN	06/16/2021	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
667-275-4XXX	MD	ONVOY, LLC - MD (Sinch)	0004323028	RMD0001966	876D	TOWSON	NOCLLIKNOWN	06/16/2021	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
667-275-5XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	07/08/2021	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
667-275-6XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	07/08/2021	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
667-275-7XXX	MD	PEERLESS NETWORK OF MARYLAND, LLC		N/A	568G	TOWSON	NOCLLIKNOWN	11/29/2019	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
667-275-8XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	03/05/2020	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
667-275-9XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	08/06/2020	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
667-278	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	03/09/2020	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
667-278 is split into 1,000-number blocks - detail below
667-278-0XXX	MD	VONAGE AMERICA LLC	0029173770	RMD0032974	197D	TOWSON	NOCLLIKNOWN	05/01/2020	Prefix Type: IPES Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
667-278-1XXX	MD	VONAGE AMERICA LLC	0029173770	RMD0032974	197D	TOWSON	NOCLLIKNOWN	05/01/2020	Prefix Type: IPES Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
667-278-2XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	06/24/2020	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
667-278-3XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	07/15/2020	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
667-278-4XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	07/15/2020	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
667-278-5XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	04/02/2020	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
667-278-6XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	04/02/2020	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
667-278-7XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	04/02/2020	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
667-278-8XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	04/02/2020	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
667-278-9XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	03/10/2020	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
667-294	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	09/21/2020	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
667-294 is split into 1,000-number blocks - detail below
667-294-0XXX	MD	OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC (T-Mobile US, Inc)		N/A	6855	TOWSON	BLTMMDCH40Z	10/07/2020	Prefix Type: PCS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCH40Z))
667-294-1XXX	MD	ONVOY SPECTRUM, LLC (Sinch)	0024415002	RMD0002045	624H	TOWSON	NOCLLIKNOWN	04/24/2021	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
667-294-2XXX	MD	ONVOY, LLC - MD (Sinch)	0004323028	RMD0001966	876D	TOWSON	NOCLLIKNOWN	09/04/2025	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
667-294-3XXX	MD	BANDWIDTH.COM CLEC, LLC - MD	0017042060	RMD0003709	071F	TOWSON	NOCLLIKNOWN	09/01/2022	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
667-294-4XXX	MD	PEERLESS NETWORK OF MARYLAND, LLC		N/A	568G	TOWSON	NOCLLIKNOWN	01/28/2021	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
667-294-5XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	09/22/2020	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
667-294-6XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	09/22/2020	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
667-294-7XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	09/22/2020	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
667-294-8XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	09/22/2020	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
667-294-9XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	09/22/2020	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
667-308	MD	PEERLESS NETWORK OF MARYLAND, LLC		N/A	568G	TOWSON	BLTQMD01DS0	11/20/2012	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTQMD01DS0))
667-308 is split into 1,000-number blocks - detail below
667-308-0XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	07/08/2021	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
667-308-1XXX	MD	OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC (T-Mobile US, Inc)		N/A	6855	TOWSON	BLTMMDCH40Z	05/19/2023	Prefix Type: PCS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCH40Z))
667-308-2XXX	MD	COMCAST IP PHONE, LLC (Comcast)	0008497687	RMD0003552	318J	TOWSON	BLTMMDCHXFX	07/12/2013	Prefix Type: IPES Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCHXFX))
667-308-3XXX	MD	ONVOY, LLC - MD (Sinch)	0004323028	RMD0001966	876D	TOWSON	NOCLLIKNOWN	08/07/2014	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
667-308-4XXX	MD	METROPCS, INC. (T-Mobile US, Inc)		N/A	5562	TOWSON	BLTMMDCHFMD	07/02/2013	Prefix Type: PCS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCHFMD))
667-308-5XXX	MD	METROPCS, INC. (T-Mobile US, Inc)		N/A	5562	TOWSON	BLTMMDCHFMD	07/02/2013	Prefix Type: PCS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCHFMD))
667-308-6XXX	MD	METROPCS, INC. (T-Mobile US, Inc)		N/A	5562	TOWSON	BLTMMDCHFMD	07/02/2013	Prefix Type: PCS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCHFMD))
667-308-7XXX	MD	CENTURYLINK COMMUNICATIONS, LLC (Lumen Technologies, Inc)	0031422439	RMD0006976	508J	TOWSON	BLTMMDDN2MD	08/05/2013	Prefix Type: IPES Switch Name: GLENBURNIE Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDDN2MD))
667-308-8XXX	MD	PEERLESS NETWORK OF MARYLAND, LLC		N/A	568G	TOWSON	BLTQMD01DS0	11/26/2012	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTQMD01DS0))
667-308-9XXX	MD	IP HORIZON LLC	0027469766	RMD0001571	515J	TOWSON	NOCLLIKNOWN	08/12/2013	Prefix Type: IPES Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
667-331	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	07/08/2021	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
667-331 is split into 1,000-number blocks - detail below
667-331-0XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	07/13/2021	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
667-331-1XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	03/04/2022	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
667-331-2XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	03/04/2022	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
667-331-3XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	03/04/2022	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
667-331-4XXX	MD	OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC (T-Mobile US, Inc)		N/A	6855	TOWSON	BLTMMDCH40Z	07/15/2021	Prefix Type: PCS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCH40Z))
667-331-5XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	07/08/2021	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
667-331-6XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	07/08/2021	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
667-331-7XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	07/08/2021	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
667-331-8XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	07/08/2021	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
667-331-9XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	07/08/2021	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
667-383	MD	OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC (T-Mobile US, Inc)		N/A	6855	TOWSON	BLTMMDCH40Z	12/07/2021	Prefix Type: PCS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCH40Z))
667-383 is split into 1,000-number blocks - detail below
667-383-0XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	03/04/2022	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
667-383-1XXX	MD	ONVOY SPECTRUM, LLC (Sinch)	0024415002	RMD0002045	624H	TOWSON	NOCLLIKNOWN	02/23/2022	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
667-383-2XXX	MD	ONVOY SPECTRUM, LLC (Sinch)	0024415002	RMD0002045	624H	TOWSON	NOCLLIKNOWN	02/23/2022	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
667-383-3XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	TOWSON	TWSNMDTWDS0	05/06/2026	Prefix Type: WIRELESS Switch Name: TOWSON Switch Type: WECO 5ESS (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: TWSNMDTWDS0))
667-383-4XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	TOWSON	CLMAMDORGT0	03/04/2022	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
667-383-5XXX	MD	OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC (T-Mobile US, Inc)		N/A	6855	TOWSON	BLTMMDCH40Z	12/07/2021	Prefix Type: PCS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCH40Z))
667-383-6XXX	MD	OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC (T-Mobile US, Inc)		N/A	6855	TOWSON	BLTMMDCH40Z	05/19/2023	Prefix Type: PCS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCH40Z))
667-383-7XXX	MD	ONVOY, LLC - MD (Sinch)	0004323028	RMD0001966	876D	TOWSON	NOCLLIKNOWN	09/16/2022	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
667-383-8XXX	MD	ONVOY, LLC - MD (Sinch)	0004323028	RMD0001966	876D	TOWSON	NOCLLIKNOWN	09/16/2022	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
667-383-9XXX	MD	OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC (T-Mobile US, Inc)		N/A	6855	TOWSON	BLTMMDCH40Z	12/07/2021	Prefix Type: PCS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCH40Z))
667-403	MD	ONVOY, LLC - MD (Sinch)	0004323028	RMD0001966	876D	TOWSON	BLTMMDCH42Z	09/01/2021	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCH42Z))
667-403 is split into 1,000-number blocks - detail below
667-403-0XXX	MD	OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC (T-Mobile US, Inc)		N/A	6855	TOWSON	BLTMMDCH40Z	09/10/2021	Prefix Type: PCS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCH40Z))
667-403-1XXX	MD	OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC (T-Mobile US, Inc)		N/A	6855	TOWSON	BLTMMDCH40Z	09/10/2021	Prefix Type: PCS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCH40Z))
667-403-2XXX	MD	ONVOY, LLC - MD (Sinch)	0004323028	RMD0001966	876D	TOWSON	BLTMMDCH42Z	09/01/2021	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCH42Z))
667-403-3XXX	MD	ONVOY SPECTRUM, LLC (Sinch)	0024415002	RMD0002045	624H	TOWSON	NOCLLIKNOWN	10/20/2021	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
667-403-4XXX	MD	ONVOY SPECTRUM, LLC (Sinch)	0024415002	RMD0002045	624H	TOWSON	NOCLLIKNOWN	10/20/2021	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
667-403-5XXX	MD	ONVOY SPECTRUM, LLC (Sinch)	0024415002	RMD0002045	624H	TOWSON	NOCLLIKNOWN	10/20/2021	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
667-403-6XXX	MD	COMMIO, LLC	0028135630	RMD0005575	939H	TOWSON	NOCLLIKNOWN	09/16/2021	Prefix Type: IPES Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
667-403-7XXX	MD	COMMIO, LLC	0028135630	RMD0005575	939H	TOWSON	NOCLLIKNOWN	09/16/2021	Prefix Type: IPES Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
667-403-8XXX	MD	COMMIO, LLC	0028135630	RMD0005575	939H	TOWSON	NOCLLIKNOWN	09/16/2021	Prefix Type: IPES Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
667-403-9XXX	MD	COMMIO, LLC	0028135630	RMD0005575	939H	TOWSON	NOCLLIKNOWN	09/16/2021	Prefix Type: IPES Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
667-436	MD	OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC (T-Mobile US, Inc)		N/A	6855	TOWSON	BLTMMDCH40Z	05/19/2023	Prefix Type: PCS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCH40Z))
667-436 is split into 1,000-number blocks - detail below
667-436-0XXX	MD	ONVOY, LLC - MD (Sinch)	0004323028	RMD0001966	876D	TOWSON	NOCLLIKNOWN	11/20/2024	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
667-436-1XXX	MD	ONVOY, LLC - MD (Sinch)	0004323028	RMD0001966	876D	TOWSON	NOCLLIKNOWN	11/20/2024	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
667-436-2XXX	MD	PEERLESS NETWORK OF MARYLAND, LLC		N/A	568G	TOWSON	NOCLLIKNOWN	10/21/2024	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
667-436-3XXX	MD	ONVOY, LLC - MD (Sinch)	0004323028	RMD0001966	876D	TOWSON	NOCLLIKNOWN	03/26/2024	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
667-436-4XXX	MD	ONVOY, LLC - MD (Sinch)	0004323028	RMD0001966	876D	TOWSON	NOCLLIKNOWN	03/26/2024	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
667-436-5XXX	MD	ONVOY, LLC - MD (Sinch)	0004323028	RMD0001966	876D	TOWSON	NOCLLIKNOWN	03/26/2024	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
667-436-6XXX	MD	ONVOY, LLC - MD (Sinch)	0004323028	RMD0001966	876D	TOWSON	NOCLLIKNOWN	11/04/2025	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
667-436-7XXX	MD	OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC (T-Mobile US, Inc)		N/A	6855	TOWSON	BLTMMDCH40Z	09/07/2023	Prefix Type: PCS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCH40Z))
667-436-8XXX	MD	OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC (T-Mobile US, Inc)		N/A	6855	TOWSON	BLTMMDCH40Z	09/07/2023	Prefix Type: PCS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCH40Z))
667-436-9XXX	MD	OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC (T-Mobile US, Inc)		N/A	6855	TOWSON	BLTMMDCH40Z	05/19/2023	Prefix Type: PCS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCH40Z))