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npa-nxx	State/Province	Company	FRN	RMD	OCN	Rate Center	CLLI	Assign Date	Misc
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))