TelcoData.US: Search by Area Code / Exchange

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npa-nxx	State/Province	Company	FRN	RMD	OCN	Rate Center	CLLI	Assign Date	Misc
443-364	MD	TELEPORT COMMUNICATIONS AMERICA, LLC - MD (AT&T)	0004274114	RMD0003897	7325	ELLICOTTCY	CLMAMDNIDS1	00/00/0000	Prefix Type: CLEC Switch Name: COLUMBIA Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDNIDS1))
443-364 is split into 1,000-number blocks - detail below
443-364-0XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	ELLICOTTCY	NOCLLIKNOWN	07/30/2018	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
443-364-1XXX	MD	METROPCS, INC. (T-Mobile US, Inc)		N/A	5562	ELLICOTTCY	NOCLLIKNOWN	04/05/2018	Prefix Type: PCS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
443-364-2XXX	MD	LEVEL 3 COMMUNICATIONS, LLC - MD (Lumen Technologies, Inc)	0015338122	RMD0006112	6119	ELLICOTTCY	NOCLLIKNOWN	05/11/2007	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
443-364-3XXX	MD	ONVOY, LLC - MD (Sinch)	0004323028	RMD0001966	876D	ELLICOTTCY	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))
443-364-4XXX	MD	YMAX COMMUNICATIONS CORP. - MD (YMAX (a/k/a MagicJack))	0013563077	RMD0001448	281E	ELLICOTTCY	NOCLLIKNOWN	06/26/2008	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
443-364-5XXX	MD	TELEPORT COMMUNICATIONS AMERICA, LLC - MD (AT&T)	0004274114	RMD0003897	7325	ELLICOTTCY	CLMAMDNIDS1	N/A	Prefix Type: CLEC Switch Name: COLUMBIA Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDNIDS1 ))
443-364-6XXX	MD	YMAX COMMUNICATIONS CORP. - MD (YMAX (a/k/a MagicJack))	0013563077	RMD0001448	281E	ELLICOTTCY	NOCLLIKNOWN	01/30/2009	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
443-364-7XXX	MD	YMAX COMMUNICATIONS CORP. - MD (YMAX (a/k/a MagicJack))	0013563077	RMD0001448	281E	ELLICOTTCY	NOCLLIKNOWN	01/30/2009	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
443-364-8XXX	MD	BANDWIDTH.COM CLEC, LLC - MD	0017042060	RMD0003709	071F	ELLICOTTCY	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))
443-364-9XXX	MD	LEVEL 3 COMMUNICATIONS, LLC - MD (Lumen Technologies, Inc)	0015338122	RMD0006112	6119	ELLICOTTCY	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))