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npa-nxx	State/Province	Company	FRN	RMD	OCN	Rate Center	CLLI	Assign Date	Misc
443-367	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	COLUMBIA	CLMAMDCBRP0	00/00/0000	Prefix Type: RBOC Switch Name: COLUMBIA Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDCBRP0))
443-367 is split into 1,000-number blocks - detail below
443-367-0XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	COLUMBIA	CLMAMDCBRP0	N/A	Prefix Type: RBOC Switch Name: COLUMBIA Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDCBRP0))
443-367-1XXX	MD	OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC (T-Mobile US, Inc)		N/A	6855	COLUMBIA	BLTMMDCH03Z	06/02/2005	Prefix Type: PCS Switch Name: BALTIMORE Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCH03Z))
443-367-2XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	COLUMBIA	CLMAMDCBRP0	N/A	Prefix Type: RBOC Switch Name: COLUMBIA Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDCBRP0))
443-367-3XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	COLUMBIA	CLMAMDCBRP0	N/A	Prefix Type: RBOC Switch Name: COLUMBIA Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDCBRP0))
443-367-4XXX	MD	PAETEC ITEL, LLC	0015247810	RMD0038378	829J	COLUMBIA	CLMAMDJTDSA	05/25/2007	Prefix Type: IPES Switch Name: COLUMBIA Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDJTDSA))
443-367-5XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	COLUMBIA	CLMAMDCBRP0	N/A	Prefix Type: RBOC Switch Name: COLUMBIA Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDCBRP0))
443-367-6XXX	MD	CORE COMMUNICATIONS, INC.- MD		N/A	2593	COLUMBIA	NOCLLIKNOWN	03/14/2019	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
443-367-7XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	COLUMBIA	CLMAMDCBRP0	N/A	Prefix Type: RBOC Switch Name: COLUMBIA Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDCBRP0))
443-367-8XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	COLUMBIA	BLTOMDKHBMD	09/29/2011	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHBMD))
443-367-9XXX	MD	LEVEL 3 COMMUNICATIONS, LLC - MD (Lumen Technologies, Inc)	0015338122	RMD0006112	6119	COLUMBIA	NOCLLIKNOWN	03/10/2011	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))