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npa-nxx	State/Province	Company	FRN	RMD	OCN	Rate Center	CLLI	Assign Date	Misc
301-557	MD	LEVEL 3 COMMUNICATIONS, LLC - MD (Lumen Technologies, Inc)	0015338122	RMD0006112	6119	WSHNGTNZN3	MCLNVA23DS4	09/06/2011	Prefix Type: CLEC Switch Name: MCLEAN Switch Type: N/A LATA: N/A Tandem: N/A 🔧 Explore Switch(CLLI: MCLNVA23DS4))
301-557 is split into 1,000-number blocks - detail below
301-557-0XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	WSHNGTNZN3	BTVLMD18GT0	09/02/2014	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: N/A Tandem: N/A 🔧 Explore Switch(CLLI: BTVLMD18GT0))
301-557-1XXX	MD	LEVEL 3 COMMUNICATIONS, LLC - MD (Lumen Technologies, Inc)	0015338122	RMD0006112	6119	WSHNGTNZN3	MCLNVA23DS4	09/16/2011	Prefix Type: CLEC Switch Name: MCLEAN Switch Type: N/A LATA: N/A Tandem: N/A 🔧 Explore Switch(CLLI: MCLNVA23DS4))
301-557-2XXX	MD	LEVEL 3 COMMUNICATIONS, LLC - MD (Lumen Technologies, Inc)	0015338122	RMD0006112	6119	WSHNGTNZN3	MCLNVA23DS4	09/16/2011	Prefix Type: CLEC Switch Name: MCLEAN Switch Type: N/A LATA: N/A Tandem: N/A 🔧 Explore Switch(CLLI: MCLNVA23DS4))
301-557-3XXX	MD	LEVEL 3 COMMUNICATIONS, LLC - MD (Lumen Technologies, Inc)	0015338122	RMD0006112	6119	WSHNGTNZN3	MCLNVA23DS4	09/16/2011	Prefix Type: CLEC Switch Name: MCLEAN Switch Type: N/A LATA: N/A Tandem: N/A 🔧 Explore Switch(CLLI: MCLNVA23DS4))
301-557-4XXX	MD	LEVEL 3 COMMUNICATIONS, LLC - MD (Lumen Technologies, Inc)	0015338122	RMD0006112	6119	WSHNGTNZN3	MCLNVA23DS4	09/16/2011	Prefix Type: CLEC Switch Name: MCLEAN Switch Type: N/A LATA: N/A Tandem: N/A 🔧 Explore Switch(CLLI: MCLNVA23DS4))
301-557-5XXX	MD	LEVEL 3 COMMUNICATIONS, LLC - MD (Lumen Technologies, Inc)	0015338122	RMD0006112	6119	WSHNGTNZN3	MCLNVA23DS4	09/16/2011	Prefix Type: CLEC Switch Name: MCLEAN Switch Type: N/A LATA: N/A Tandem: N/A 🔧 Explore Switch(CLLI: MCLNVA23DS4))
301-557-6XXX	MD	LEVEL 3 COMMUNICATIONS, LLC - MD (Lumen Technologies, Inc)	0015338122	RMD0006112	6119	WSHNGTNZN3	MCLNVA23DS4	09/16/2011	Prefix Type: CLEC Switch Name: MCLEAN Switch Type: N/A LATA: N/A Tandem: N/A 🔧 Explore Switch(CLLI: MCLNVA23DS4))
301-557-7XXX	MD	LEVEL 3 COMMUNICATIONS, LLC - MD (Lumen Technologies, Inc)	0015338122	RMD0006112	6119	WSHNGTNZN3	MCLNVA23DS4	09/16/2011	Prefix Type: CLEC Switch Name: MCLEAN Switch Type: N/A LATA: N/A Tandem: N/A 🔧 Explore Switch(CLLI: MCLNVA23DS4))
301-557-8XXX	MD	LEVEL 3 COMMUNICATIONS, LLC - MD (Lumen Technologies, Inc)	0015338122	RMD0006112	6119	WSHNGTNZN3	MCLNVA23DS4	09/16/2011	Prefix Type: CLEC Switch Name: MCLEAN Switch Type: N/A LATA: N/A Tandem: N/A 🔧 Explore Switch(CLLI: MCLNVA23DS4))
301-557-9XXX	MD	COMCAST IP PHONE, LLC (Comcast)	0008497687	RMD0003552	318J	WSHNGTNZN3	ARTNVAARXDY	08/15/2013	Prefix Type: IPES Switch Name: N/A Switch Type: N/A LATA: N/A Tandem: N/A 🔧 Explore Switch(CLLI: ARTNVAARXDY))