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npa-nxx	State/Province	Company	FRN	RMD	OCN	Rate Center	CLLI	Assign Date	Misc
443-766	MD	PAETEC ITEL, LLC	0015247810	RMD0038378	829J	COLUMBIA	CLMAMDJTDSA	05/18/2005	Prefix Type: IPES Switch Name: COLUMBIA Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDJTDSA))
443-766 is split into 1,000-number blocks - detail below
443-766-0XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	COLUMBIA	BLTOMDKHBMD	11/28/2007	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHBMD))
443-766-1XXX	MD	PAETEC ITEL, LLC	0015247810	RMD0038378	829J	COLUMBIA	CLMAMDJTDSA	05/19/2005	Prefix Type: IPES Switch Name: COLUMBIA Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDJTDSA))
443-766-2XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	COLUMBIA	CLMAMDORGT0	07/22/2016	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-766-3XXX	MD	NEW CINGULAR WIRELESS PCS, LLC - DC (AT&T Wireless)	0003291192	RMD0036909	4036	COLUMBIA	CLMAMDORGT0	07/22/2016	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDORGT0))
443-766-4XXX	MD	METROPCS, INC. (T-Mobile US, Inc)		N/A	5562	COLUMBIA	BLTMMDCHFMD	08/27/2015	Prefix Type: PCS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCHFMD))
443-766-5XXX	MD	METROPCS, INC. (T-Mobile US, Inc)		N/A	5562	COLUMBIA	BLTMMDCHFMD	08/05/2015	Prefix Type: PCS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCHFMD))
443-766-6XXX	MD	METROPCS, INC. (T-Mobile US, Inc)		N/A	5562	COLUMBIA	BLTMMDCHFMD	08/27/2015	Prefix Type: PCS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCHFMD))
443-766-7XXX	MD	PAETEC ITEL, LLC	0015247810	RMD0038378	829J	COLUMBIA	CLMAMDJTDSA	06/19/2006	Prefix Type: IPES Switch Name: COLUMBIA Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: CLMAMDJTDSA))
443-766-8XXX	MD	METROPCS, INC. (T-Mobile US, Inc)		N/A	5562	COLUMBIA	BLTMMDCHFMD	08/05/2015	Prefix Type: PCS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTMMDCHFMD))
443-766-9XXX	MD	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD (Verizon Wireless)	0003290673	RMD0003382	6395	COLUMBIA	BLTOMDKHBMD	12/27/2007	Prefix Type: WIRELESS Switch Name: N/A Switch Type: N/A LATA: Baltimore MD (238) Tandem: N/A 🔧 Explore Switch(CLLI: BLTOMDKHBMD))