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.

North East, MD

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
410-287 A NRTEMDNERS0  9212 VERIZON MARYLAND, INC. 238      
410-656 A BLTMMDCH47Z  420C ARMSTRONG TELECOMMUNICATIONS, INC. - MD 238      
410-656 0 BLTMMDCH47Z  420C ARMSTRONG TELECOMMUNICATIONS, INC. - MD 238   2008-08-04   
410-656 1 BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2012-06-23   
410-656 2 BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2011-01-09   
410-656 3 BLTOMDKHDS0  7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 238   2011-02-01   
410-656 4 BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2010-02-22   
410-656 5   829J PAETEC ITEL, LLC 238   2009-05-08   
410-656 6 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2012-10-07   
410-656 7 BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2014-01-02   
410-656 8 BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2014-03-15   
410-656 9 BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2008-12-11   
443-256 A   829J PAETEC ITEL, LLC 238   2025-04-01   
443-256 0   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2019-07-14   
443-256 1   829J PAETEC ITEL, LLC 238      
443-256 2 BLTMMDCH40Z  5562 METROPCS, INC. 238   2019-03-31   
443-256 3 BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2014-06-15   
443-256 4 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2014-09-20   
443-256 5 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2014-09-20   
443-256 6 BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2014-11-03   
443-256 7 BLTMMDDN2MD  508J CENTURYLINK COMMUNICATIONS, LLC 238   2014-06-25   
443-256 8 CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2014-10-01   
443-256 9 BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2014-11-03   
443-674 A BLTMMDFMDS0  7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238      
443-674 0 BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2006-05-26   
443-674 1   829J PAETEC ITEL, LLC 238   2004-02-05   
443-674 2 CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2019-10-18   
443-674 3 BLTMMDCH40Z  5562 METROPCS, INC. 238   2019-01-22   
443-674 4   2593 CORE COMMUNICATIONS, INC.- MD 238   2018-06-16   
443-674 5   2593 CORE COMMUNICATIONS, INC.- MD 238   2004-04-02   
443-674 6 BLTMMDCH40Z  5562 METROPCS, INC. 238   2017-04-04   
443-674 7 BLTMMDCH40Z  5562 METROPCS, INC. 238   2017-08-13   
443-674 8 BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2005-07-25   
443-674 9 BLTMMDFMDS0  7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238      
443-715 A   829J PAETEC ITEL, LLC 238   2025-04-01   
443-715 0   829J PAETEC ITEL, LLC 238      
443-715 2 BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2016-10-19   
443-715 3   829J PAETEC ITEL, LLC 238      
443-715 4 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2021-04-29   
443-715 5 BLTQMD018MD  145J TERRA NOVA TELECOM INC. 238   2024-02-15   
443-715 6 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2021-04-29   
443-715 7 BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2008-05-16   
443-715 9 BLTQMD018MD  145J TERRA NOVA TELECOM INC. 238   2024-09-12   
443-877 A BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-877 0   145J TERRA NOVA TELECOM INC. 238   2021-01-28   
443-877 1 BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2005-02-04   
443-877 2 CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2017-10-16   
443-877 3 BLTMMDCH40Z  5562 METROPCS, INC. 238   2018-10-19   
443-877 4 BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-877 5 BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2015-02-13   
443-877 6 BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2007-12-30   
443-877 7 CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2014-05-02   
443-877 8 CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2016-01-08   
443-877 9 BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2015-02-13   
443-967 A NRTEMDNERS0  9212 VERIZON MARYLAND, INC. 238      
443-967 0 NRTEMDNERS0  9212 VERIZON MARYLAND, INC. 238      
443-967 1 BLTQMD01DS0  568G PEERLESS NETWORK OF MARYLAND, LLC 238   2013-05-04   
443-967 2 BLTMMDCH3MD  228C IDT AMERICA, CORP. - MD 238   2012-01-08   
443-967 3 CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2013-05-23   
443-967 4 CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2016-08-22   
443-967 5 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2016-03-21   
443-967 6 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2016-03-21   
443-967 7 BLTMMDCHX7X  073H TELNYX LLC 238   2017-04-26   
443-967 8 BLTQMD01DS0  568G PEERLESS NETWORK OF MARYLAND, LLC 238   2013-05-04   
443-967 9 BLTMMDCH40Z  5562 METROPCS, INC. 238   2018-12-31   
667-647 A BLTMMDCHXUX  624H ONVOY SPECTRUM, LLC 238      
667-647 0 CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2022-10-01   
667-647 1   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2025-03-04   
667-647 2 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2021-07-12   
667-647 3 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2021-07-12   
667-647 4 BLTMMDCHXUX  624H ONVOY SPECTRUM, LLC 238   2022-02-04   
667-647 6 BLTMMDCHXUX  624H ONVOY SPECTRUM, LLC 238   2021-06-26   
667-647 7 BLTMMDCHXUX  624H ONVOY SPECTRUM, LLC 238   2022-02-04   

Last updated: Sat, 05 Apr 2025 03:03:23 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.