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npa-nxx	State/Province	Company	FRN	RMD	OCN	Rate Center	CLLI	Assign Date	Misc
410-238	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	ESSEX	ESSXMDEXDS0	00/00/0000	Prefix Type: RBOC Switch Name: ESSEX Switch Type: Northern Telecom DMS10S LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: ESSXMDEXDS0))
410-238 is split into 1,000-number blocks - detail below
410-238-0XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	ESSEX	ESSXMDEXDS0	N/A	Prefix Type: RBOC Switch Name: ESSEX Switch Type: Northern Telecom DMS10S LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: ESSXMDEXDS0))
410-238-1XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	ESSEX	ESSXMDEXDS0	N/A	Prefix Type: RBOC Switch Name: ESSEX Switch Type: Northern Telecom DMS10S LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: ESSXMDEXDS0))
410-238-2XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	ESSEX	ESSXMDEXDS0	N/A	Prefix Type: RBOC Switch Name: ESSEX Switch Type: Northern Telecom DMS10S LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: ESSXMDEXDS0))
410-238-3XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	ESSEX	ESSXMDEXDS0	N/A	Prefix Type: RBOC Switch Name: ESSEX Switch Type: Northern Telecom DMS10S LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: ESSXMDEXDS0))
410-238-4XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	ESSEX	ESSXMDEXDS0	N/A	Prefix Type: RBOC Switch Name: ESSEX Switch Type: Northern Telecom DMS10S LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: ESSXMDEXDS0))
410-238-5XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	ESSEX	ESSXMDEXDS0	N/A	Prefix Type: RBOC Switch Name: ESSEX Switch Type: Northern Telecom DMS10S LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: ESSXMDEXDS0))
410-238-6XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	ESSEX	ESSXMDEXDS0	N/A	Prefix Type: RBOC Switch Name: ESSEX Switch Type: Northern Telecom DMS10S LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: ESSXMDEXDS0))
410-238-7XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	ESSEX	ESSXMDEXDS0	N/A	Prefix Type: RBOC Switch Name: ESSEX Switch Type: Northern Telecom DMS10S LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: ESSXMDEXDS0))
410-238-8XXX	MD	VERIZON MARYLAND, INC. (Verizon Communications)	0002166825	RMD0002941	9212	ESSEX	ESSXMDEXDS0	N/A	Prefix Type: RBOC Switch Name: ESSEX Switch Type: Northern Telecom DMS10S LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: ESSXMDEXDS0))
410-238-9XXX	MD	BALTIMORE-WASHINGTON TELEPHONE (BWT)	0008104507	RMD0004516	8697	ESSEX	NOCLLIKNOWN	05/18/2015	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))