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npa-nxx	State/Province	Company	FRN	RMD	OCN	Rate Center	CLLI	Assign Date	Misc
410-953	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	COLUMBIA	CLMAMDSRRS0	00/00/0000	Prefix Type: RBOC Switch Name: COLUMBIA Switch Type: AT&T Tech Optic Remote Switch LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDSRRS0))
410-953 is split into 1,000-number blocks - detail below
410-953-0XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	COLUMBIA	CLMAMDSRRS0	N/A	Prefix Type: RBOC Switch Name: COLUMBIA Switch Type: AT&T Tech Optic Remote Switch LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDSRRS0))
410-953-1XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	COLUMBIA	CLMAMDSRRS0	N/A	Prefix Type: RBOC Switch Name: COLUMBIA Switch Type: AT&T Tech Optic Remote Switch LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDSRRS0))
410-953-2XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	COLUMBIA	CLMAMDSRRS0	N/A	Prefix Type: RBOC Switch Name: COLUMBIA Switch Type: AT&T Tech Optic Remote Switch LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDSRRS0))
410-953-3XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	COLUMBIA	CLMAMDSRRS0	N/A	Prefix Type: RBOC Switch Name: COLUMBIA Switch Type: AT&T Tech Optic Remote Switch LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDSRRS0))
410-953-4XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	COLUMBIA	CLMAMDSRRS0	N/A	Prefix Type: RBOC Switch Name: COLUMBIA Switch Type: AT&T Tech Optic Remote Switch LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDSRRS0))
410-953-5XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	COLUMBIA	CLMAMDSRRS0	N/A	Prefix Type: RBOC Switch Name: COLUMBIA Switch Type: AT&T Tech Optic Remote Switch LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDSRRS0))
410-953-6XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	COLUMBIA	CLMAMDSRRS0	N/A	Prefix Type: RBOC Switch Name: COLUMBIA Switch Type: AT&T Tech Optic Remote Switch LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDSRRS0))
410-953-7XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	COLUMBIA	CLMAMDSRRS0	N/A	Prefix Type: RBOC Switch Name: COLUMBIA Switch Type: AT&T Tech Optic Remote Switch LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDSRRS0))
410-953-8XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	COLUMBIA	CLMAMDSRRS0	N/A	Prefix Type: RBOC Switch Name: COLUMBIA Switch Type: AT&T Tech Optic Remote Switch LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDSRRS0))
410-953-9XXX	MD	OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC (T-Mobile US, Inc)		N/A	6855	COLUMBIA	BLTMMDCH03Z	08/26/2010	Prefix Type: PCS Switch Name: BALTIMORE Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCH03Z))