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 14, MD

1 2 3 4 5 6 >>

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
240-206 A WASHDCCZDS0  4773 XO MARYLAND, LLC 236      
240-206 0   4773 XO MARYLAND, LLC 236      
240-206 1   071F BANDWIDTH.COM CLEC, LLC - MD 236   2010-04-18   
240-206 2   4773 XO MARYLAND, LLC 236      
240-206 3   4773 XO MARYLAND, LLC 236   2005-08-15   
240-206 4   4773 XO MARYLAND, LLC 236   2005-08-15   
240-206 5   071F BANDWIDTH.COM CLEC, LLC - MD 236   2007-09-13   
240-206 6   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236   2008-02-15   
240-206 7   7228 MCI WORLDCOM COMMUNICATIONS, INC. - MD 236   2008-10-01   
240-206 8   107D COMCAST PHONE OF NORTHERN MARYLAND, INC. - MD 236   2007-11-01   
240-206 9   107D COMCAST PHONE OF NORTHERN MARYLAND, INC. - MD 236   2006-03-14   
240-232 A WASHDCRKDS2  8864 BROADWING COMMUNICATIONS. LLC - MD 236      
240-232 0   8864 BROADWING COMMUNICATIONS. LLC - MD 236      
240-232 1   8864 BROADWING COMMUNICATIONS. LLC - MD 236      
240-232 2   071F BANDWIDTH.COM CLEC, LLC - MD 236   2010-08-13   
240-232 3   8864 BROADWING COMMUNICATIONS. LLC - MD 236      
240-232 4   8864 BROADWING COMMUNICATIONS. LLC - MD 236      
240-232 5   071F BANDWIDTH.COM CLEC, LLC - MD 236   2010-10-17   
240-232 6   071F BANDWIDTH.COM CLEC, LLC - MD 236   2011-02-26   
240-232 7   071F BANDWIDTH.COM CLEC, LLC - MD 236   2011-05-20   
240-232 8   071F BANDWIDTH.COM CLEC, LLC - MD 236   2014-06-06   
240-232 9   8864 BROADWING COMMUNICATIONS. LLC - MD 236      
240-245 A LNHMMDADDS0  8832 STARPOWER COMMUNICATIONS, LLC - MD 236      
240-245 0   071F BANDWIDTH.COM CLEC, LLC - MD 236   2008-12-13   
240-245 1   2697 CTC COMMUNICATIONS CORP. - MD 236   2006-01-14   
240-245 2   876D ONVOY, LLC - MD 236   2012-10-07   
240-245 3   107D COMCAST PHONE OF NORTHERN MARYLAND, INC. - MD 236   2007-05-02   
240-245 4   107D COMCAST PHONE OF NORTHERN MARYLAND, INC. - MD 236   2006-10-21   
240-245 5   071F BANDWIDTH.COM CLEC, LLC - MD 236   2010-08-19   
240-245 6   071F BANDWIDTH.COM CLEC, LLC - MD 236   2010-08-19   
240-245 7   071F BANDWIDTH.COM CLEC, LLC - MD 236   2011-05-20   
240-245 8   8832 STARPOWER COMMUNICATIONS, LLC - MD 236      
240-245 9   082H LOCAL ACCESS LLC - MD 236   2013-09-06   
240-260 A WASHDCRKDS3  8992 ALLEGIANCE TELECOM, INC. - MD 236      
240-260 0   8992 ALLEGIANCE TELECOM, INC. - MD 236      
240-260 1   8992 ALLEGIANCE TELECOM, INC. - MD 236      
240-260 2   8992 ALLEGIANCE TELECOM, INC. - MD 236      
240-260 3   107D COMCAST PHONE OF NORTHERN MARYLAND, INC. - MD 236   2017-11-13   
240-260 4   8992 ALLEGIANCE TELECOM, INC. - MD 236      
240-260 5   2593 CORE COMMUNICATIONS, INC. - MD 236   2018-10-23   
240-260 6   2593 CORE COMMUNICATIONS, INC. - MD 236   2018-10-23   
240-260 7   5562 METRO PCS, INC. 236   2017-10-01   
240-260 8   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2018-10-22   
240-260 9   8992 ALLEGIANCE TELECOM, INC. - MD 236      
240-266 A   568G PEERLESS NETWORK OF MARYLAND, LLC 236      
240-266 0   568G PEERLESS NETWORK OF MARYLAND, LLC 236      
240-334 A WASJDCDCDS0  6050 GLOBAL CROSSING LOCAL SERVICES, INC.-MD 236      
240-334 0   6050 GLOBAL CROSSING LOCAL SERVICES, INC.-MD 236      
240-334 1   5562 METRO PCS, INC. 236   2013-06-16   
240-334 2   107D COMCAST PHONE OF NORTHERN MARYLAND, INC. - MD 236   2013-10-25   

1 2 3 4 5 6 >>

Last updated: Tue, 31 Dec 2019 02:37:20 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.