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npa-nxx	State/Province	Company	FRN	RMD	OCN	Rate Center	CLLI	Assign Date	Misc
443-259	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	COLUMBIA	CLMAMDOBDS0	00/00/0000	Prefix Type: RBOC Switch Name: COLUMBIA Switch Type: WECO 5ESS Host (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDOBDS0))
443-259 is split into 1,000-number blocks - detail below
443-259-0XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	COLUMBIA	CLMAMDOBDS0	N/A	Prefix Type: RBOC Switch Name: COLUMBIA Switch Type: WECO 5ESS Host (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDOBDS0))
443-259-1XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	COLUMBIA	CLMAMDOBDS0	N/A	Prefix Type: RBOC Switch Name: COLUMBIA Switch Type: WECO 5ESS Host (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDOBDS0))
443-259-2XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	COLUMBIA	CLMAMDOBDS0	N/A	Prefix Type: RBOC Switch Name: COLUMBIA Switch Type: WECO 5ESS Host (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDOBDS0))
443-259-3XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	COLUMBIA	CLMAMDOBDS0	N/A	Prefix Type: RBOC Switch Name: COLUMBIA Switch Type: WECO 5ESS Host (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDOBDS0))
443-259-4XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	COLUMBIA	CLMAMDOBDS0	N/A	Prefix Type: RBOC Switch Name: COLUMBIA Switch Type: WECO 5ESS Host (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDOBDS0))
443-259-5XXX	MD	PAETEC ITEL, LLC	0015247810	RMD0038378	829J	COLUMBIA	CLMAMDJTBMD	08/23/2013	Prefix Type: IPES Switch Name: COLUMBIA Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDJTBMD))
443-259-6XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	COLUMBIA	CLMAMDOBDS0	N/A	Prefix Type: RBOC Switch Name: COLUMBIA Switch Type: WECO 5ESS Host (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDOBDS0))
443-259-7XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	COLUMBIA	CLMAMDOBDS0	N/A	Prefix Type: RBOC Switch Name: COLUMBIA Switch Type: WECO 5ESS Host (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDOBDS0))
443-259-8XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	COLUMBIA	CLMAMDOBDS0	N/A	Prefix Type: RBOC Switch Name: COLUMBIA Switch Type: WECO 5ESS Host (Digital) LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDOBDS0))
443-259-9XXX	MD	PAETEC ITEL, LLC	0015247810	RMD0038378	829J	COLUMBIA	BLTMMDCHW29	02/03/2003	Prefix Type: IPES Switch Name: BALTIMORE Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCHW29))