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npa-nxx	State/Province	Company	FRN	RMD	OCN	Rate Center	CLLI	Assign Date	Misc
667-786	MD	TELEPORT COMMUNICATIONS AMERICA, LLC - MD (AT&T)	0004274114	RMD0003897	7325	COLUMBIA	CLMAMDNIDS1	11/04/2015	Prefix Type: CLEC Switch Name: COLUMBIA Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDNIDS1))
667-786 is split into 1,000-number blocks - detail below
667-786-0XXX	MD	METROPCS, INC. (T-Mobile US, Inc)		N/A	5562	COLUMBIA	BLTMMDCHFMD	02/22/2016	Prefix Type: PCS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCHFMD))
667-786-1XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	COLUMBIA	CLMAMDORGT0	12/09/2015	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
667-786-2XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	COLUMBIA	CLMAMDORGT0	12/09/2015	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
667-786-3XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	COLUMBIA	CLMAMDORGT0	12/09/2015	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
667-786-4XXX	MD	LEVEL 3 COMMUNICATIONS, LLC - MD (Lumen Technologies, Inc)	0015338122	RMD0006112	6119	COLUMBIA	NOCLLIKNOWN	01/12/2016	Prefix Type: CLEC Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: NOCLLIKNOWN))
667-786-5XXX	MD	TELEPORT COMMUNICATIONS AMERICA, LLC - MD (AT&T)	0004274114	RMD0003897	7325	COLUMBIA	CLMAMDNIDS1	11/05/2015	Prefix Type: CLEC Switch Name: COLUMBIA Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDNIDS1))
667-786-6XXX	MD	TELEPORT COMMUNICATIONS AMERICA, LLC - MD (AT&T)	0004274114	RMD0003897	7325	COLUMBIA	CLMAMDNIDS1	11/05/2015	Prefix Type: CLEC Switch Name: COLUMBIA Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDNIDS1))
667-786-7XXX	MD	MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD (Verizon Communications)	0004999405	RMD0002957	7228	COLUMBIA	BLTOMDKHDS0	03/02/2016	Prefix Type: CLEC Switch Name: BALTIMORE Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHDS0))
667-786-8XXX	MD	OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC (T-Mobile US, Inc)		N/A	6855	COLUMBIA	BLTMMDCH03Z	01/07/2016	Prefix Type: PCS Switch Name: BALTIMORE Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCH03Z))
667-786-9XXX	MD	OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC (T-Mobile US, Inc)		N/A	6855	COLUMBIA	BLTMMDCH03Z	01/07/2016	Prefix Type: PCS Switch Name: BALTIMORE Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCH03Z))