Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
  • Effective date searches are available only for US area codes. Our sources for non-US NPA-NXX data do not provide this information.
  • If you want to search an entire area code regardless of activity, leave both the next and past days fields set to zero.

Washington Zone 16, MD

1 2 3 4 >>

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
240-244 A LNHMMDADDS0  8832 STARPOWER COMMUNICATIONS, LLC - MD 236      
240-244 0   071F BANDWIDTH.COM CLEC, LLC - MD 236   2010-09-03   
240-244 1   107D COMCAST PHONE OF NORTHERN MARYLAND, INC. - MD 236   2006-03-03   
240-244 2   107D COMCAST PHONE OF NORTHERN MARYLAND, INC. - MD 236   2016-06-07   
240-244 3   071F BANDWIDTH.COM CLEC, LLC - MD 236   2007-09-13   
240-244 4   087F CBEYOND COMMUNICATIONS, LLC - MD 236   2008-10-05   
240-244 5   107D COMCAST PHONE OF NORTHERN MARYLAND, INC. - MD 236   2007-01-19   
240-244 6   071F BANDWIDTH.COM CLEC, LLC - MD 236   2010-02-22   
240-244 7   071F BANDWIDTH.COM CLEC, LLC - MD 236   2010-10-28   
240-244 8   8832 STARPOWER COMMUNICATIONS, LLC - MD 236      
240-244 9   071F BANDWIDTH.COM CLEC, LLC - MD 236   2008-12-13   
240-269 A   568G PEERLESS NETWORK OF MARYLAND, LLC 236      
240-303 A HRNDVA13DS0  3910 CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 236      
240-303 0   3910 CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 236      
240-303 1   3910 CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 236      
240-303 2   071F BANDWIDTH.COM CLEC, LLC - MD 236   2011-02-26   
240-303 3   912D BROADVOX-CLEC, LLC - MD 236   2012-10-07   
240-303 4   3910 CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 236      
240-303 5   3910 CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 236      
240-303 6   3910 CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 236      
240-303 7   3910 CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 236      
240-303 8   3910 CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 236      
240-303 9   3910 CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 236      
240-318 A CLTNMDCLDS0  9212 VERIZON MARYLAND, INC. 236      
240-318 0   9212 VERIZON MARYLAND, INC. 236      
240-318 1   568G PEERLESS NETWORK OF MARYLAND, LLC 236   2013-05-04   
240-318 2   107D COMCAST PHONE OF NORTHERN MARYLAND, INC. - MD 236   2008-02-22   
240-318 3   107D COMCAST PHONE OF NORTHERN MARYLAND, INC. - MD 236   2009-11-27   
240-318 4   5562 METRO PCS, INC. 236   2013-06-16   
240-318 5   107D COMCAST PHONE OF NORTHERN MARYLAND, INC. - MD 236   2013-09-08   
240-318 6   5562 METRO PCS, INC. 236   2015-02-05   
240-318 7   876D ONVOY, LLC - MD 236   2016-03-11   
240-318 8   4492 VDL, INC. DBA GLOBAL TELECOM BROKERS - MD 236   2004-04-06   
240-318 9   568G PEERLESS NETWORK OF MARYLAND, LLC 236   2013-05-04   
240-348 A RSTNVA91RS0  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236      
240-348 0   082H LOCAL ACCESS LLC - MD 236   2015-03-21   
240-348 1   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236      
240-348 2   071F BANDWIDTH.COM CLEC, LLC - MD 236   2010-08-19   
240-348 3   071F BANDWIDTH.COM CLEC, LLC - MD 236   2010-08-19   
240-348 4   107D COMCAST PHONE OF NORTHERN MARYLAND, INC. - MD 236   2010-09-10   
240-348 5   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236   2012-01-14   
240-348 6   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236   2011-10-09   
240-348 7   107D COMCAST PHONE OF NORTHERN MARYLAND, INC. - MD 236   2013-07-19   
240-348 8   876D ONVOY, LLC - MD 236   2016-03-11   
240-348 9   912D BROADVOX-CLEC, LLC - MD 236   2016-04-28   
240-407 A WASJDCDCDS0  6050 GLOBAL CROSSING LOCAL SERVICES, INC.-MD 236      
240-407 0   6050 GLOBAL CROSSING LOCAL SERVICES, INC.-MD 236      
240-407 1   912D BROADVOX-CLEC, LLC - MD 236   2016-04-28   
240-407 2   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236      
240-407 3   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236      

1 2 3 4 >>

Last updated: Thu, 31 Jan 2019 11:20:40 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.