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 12, MD

1 2 3 4 >>

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
227-296 A   876D ONVOY, LLC - MD 236   2026-03-23   
227-296 0   876D ONVOY, LLC - MD 236   2026-03-23   
240-293 A LNHMMDADGT0  8832 STARPOWER COMMUNICATIONS, LLC - MD 236      
240-293 0 WASHDCDP8MD  071F BANDWIDTH.COM CLEC, LLC - MD 236   2010-10-28   
240-293 1 WASKDCFNPS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236   2002-07-08   
240-293 2 MCLNVA23DS4  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236   2005-01-04   
240-293 3 MCLNVA23DS4  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236   2005-01-04   
240-293 4 MCLNVA23DS4  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236   2003-02-17   
240-293 5 MCLNVA23DS4  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236   2006-04-07   
240-293 6 ARTNVAARXDY  318J COMCAST IP PHONE, LLC 236   2005-07-25   
240-293 7   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2022-12-25   
240-293 8 LNHMMDADGT0  8832 STARPOWER COMMUNICATIONS, LLC - MD 236      
240-293 9 MCLNVA23DS4  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236   2006-07-14   
240-371 A WASHDC12DS6  568G PEERLESS NETWORK OF MARYLAND, LLC 236      
240-371 0 WASHDC12DS6  568G PEERLESS NETWORK OF MARYLAND, LLC 236      
240-371 1 WASHDC12DS6  568G PEERLESS NETWORK OF MARYLAND, LLC 236      
240-371 2 WASHDCSWMMD  624H ONVOY SPECTRUM, LLC 236   2022-01-15   
240-371 3 WASHDCSWMMD  624H ONVOY SPECTRUM, LLC 236   2022-01-15   
240-371 4 VINNVACBDS0  876D ONVOY, LLC - MD 236   2022-12-16   
240-371 5 WASHDC12KMD  145J TERRA NOVA TELECOM INC. 236   2024-10-07   
240-371 6 VINNVACBDS0  876D ONVOY, LLC - MD 236   2024-07-05   
240-371 7 WASHDCDP8MD  071F BANDWIDTH.COM CLEC, LLC - MD 236   2022-09-22   
240-371 8 WASHDCDP8MD  071F BANDWIDTH.COM CLEC, LLC - MD 236   2022-09-22   
240-371 9 WASHDC12DS6  568G PEERLESS NETWORK OF MARYLAND, LLC 236      
240-433 A   829J PAETEC ITEL, LLC 236   2025-04-02   
240-433 0   829J PAETEC ITEL, LLC 236      
240-433 1   829J PAETEC ITEL, LLC 236      
240-433 2 BTVLMD12CMA  5562 METROPCS, INC. 236   2013-06-16   
240-433 3 WASHDCDP8MD  071F BANDWIDTH.COM CLEC, LLC - MD 236   2007-10-22   
240-433 4   829J PAETEC ITEL, LLC 236      
240-433 5 VINNVACBDS0  876D ONVOY, LLC - MD 236   2021-09-24   
240-433 6 WASHDCSWMMD  624H ONVOY SPECTRUM, LLC 236   2021-05-21   
240-433 7 VINNVACBDS0  876D ONVOY, LLC - MD 236   2021-09-24   
240-433 8 VINNVACBDS0  876D ONVOY, LLC - MD 236   2021-09-24   
240-433 9   829J PAETEC ITEL, LLC 236      
240-471 A   876D ONVOY, LLC - MD 236      
240-471 0 VINNVACBDS0  876D ONVOY, LLC - MD 236   2024-11-04   
240-471 1 VINNVACBDS0  876D ONVOY, LLC - MD 236   2022-12-16   
240-471 2 VINNVACBDS0  876D ONVOY, LLC - MD 236   2021-04-02   
240-471 3   829J PAETEC ITEL, LLC 236   2005-02-18   
240-471 4   876D ONVOY, LLC - MD 236   2025-12-14   
240-471 5 BTVLMD12CMA  5562 METROPCS, INC. 236   2013-06-16   
240-471 6 VINNVACBDS0  876D ONVOY, LLC - MD 236   2014-10-27   
240-471 7 VINNVACBDS0  876D ONVOY, LLC - MD 236   2021-04-02   
240-471 8 VINNVACBDS0  876D ONVOY, LLC - MD 236   2021-04-02   
240-471 9 VINNVACBDS0  876D ONVOY, LLC - MD 236   2025-01-09   
240-516 A   829J PAETEC ITEL, LLC 236   2025-04-02   
240-516 0   829J PAETEC ITEL, LLC 236      
240-516 1   829J PAETEC ITEL, LLC 236      
240-516 2   829J PAETEC ITEL, LLC 236      

1 2 3 4 >>

Last updated: Thu, 05 Feb 2026 23:41:55 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.