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.

Columbia, MD

<< 1 2 3 4 5 >>

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
443-812 5 BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
443-812 6 BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
443-812 7 BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
443-812 8 BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2003-08-19   
443-812 9 BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2003-10-03   
443-832 A BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-832 0 BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2011-10-28   
443-832 1   829J PAETEC ITEL, LLC 238   2009-10-26   
443-832 2 BLTOMDKHDS0  7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 238   2009-11-13   
443-832 3 BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2010-08-15   
443-832 4 BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-832 5 BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2011-10-28   
443-832 6 BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2013-07-21   
443-832 7 BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2010-11-01   
443-832 8 BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2011-07-15   
443-832 9 BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2011-07-15   
443-864 A BLTMMDCH40Z  5562 METROPCS, INC. 238      
443-864 0 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
443-864 1 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
443-864 2 BLTMMDCH40Z  5562 METROPCS, INC. 238   2003-04-13   
443-864 3 BLTMMDCH40Z  5562 METROPCS, INC. 238   2003-11-01   
443-864 4 BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2007-10-19   
443-864 5 BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2007-10-19   
443-864 6 BLTMMDCH40Z  5562 METROPCS, INC. 238      
443-864 7 BLTMMDCH40Z  5562 METROPCS, INC. 238      
443-864 8 BLTMMDCH40Z  5562 METROPCS, INC. 238      
443-864 9 BLTMMDCH40Z  5562 METROPCS, INC. 238      
443-878 A BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
443-878 0 BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2010-02-16   
443-878 1   829J PAETEC ITEL, LLC 238   2005-08-25   
443-878 2 BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2005-09-20   
443-878 3 BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2006-03-04   
443-878 4 BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2006-04-01   
443-878 5 BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2006-04-24   
443-878 6 BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2006-04-24   
443-878 7 BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2006-02-03   
443-878 8 BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2005-07-22   
443-878 9 BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2006-04-24   
443-896 A BLTMMDCHCMD  7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238      
443-896 0 BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-896 1 CLMAMDNIDS1  7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238      
443-896 2 BLTMMDCHCMD  7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238      
443-896 3 BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2006-11-02   
443-896 4 BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2006-11-02   
443-896 5 BLTMMDCHCMD  7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238      
443-896 6 BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2006-10-02   
443-896 7 BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2007-08-02   
443-896 8 BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2007-01-02   
443-896 9 BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-917 A BLTMMDCH42Z  876D ONVOY, LLC - MD 238      
443-917 0   515J IP HORIZON LLC 238   2013-09-06   
443-917 1 BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2015-05-14   
443-917 2 BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2013-01-30   
443-917 3 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2012-02-29   
443-917 4 BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238   2013-07-22   
443-917 5 BLTQMD018MD  145J TERRA NOVA TELECOM INC. 238   2024-09-11   
443-917 6 BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2015-05-14   
443-917 7 BLTMMDDN2MD  508J CENTURYLINK COMMUNICATIONS, LLC 238   2013-10-01   
443-917 8 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2015-02-14   
443-917 9 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2015-02-14   
443-979 A BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
443-979 0 BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2012-01-19   
443-979 1 BLTMMDCH40Z  5562 METROPCS, INC. 238   2013-07-25   
443-979 2 BLTMMDCH40Z  5562 METROPCS, INC. 238   2014-11-22   
443-979 3 BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2012-05-01   
443-979 4 BLTMMDCH40Z  5562 METROPCS, INC. 238   2014-12-29   
443-979 5 BLTMMDCH40Z  5562 METROPCS, INC. 238   2014-12-29   
443-979 6 BLTMMDCH40Z  5562 METROPCS, INC. 238   2015-03-06   
443-979 7 BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2014-11-20   
443-979 8 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2014-10-20   
443-979 9 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2014-10-20   
667-200 A BLTMMDCH42Z  876D ONVOY, LLC - MD 238      
667-200 0 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2016-02-18   
667-200 1 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2016-04-28   
667-200 2 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2016-04-28   
667-200 3 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2017-06-18   
667-200 4 BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2017-12-22   
667-200 5 BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2016-04-22   
667-200 6 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2016-05-31   
667-200 7 BLTMMDCH40Z  5562 METROPCS, INC. 238   2016-03-05   
667-200 8 BLTMMDCH40Z  5562 METROPCS, INC. 238   2016-03-05   
667-200 9 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2016-05-31   
667-240 A BLTQMD012MD  964H BARR TELL USA, INC. 238      
667-240 0 BLTMMDCHX7X  073H TELNYX LLC 238   2017-03-14   
667-240 1 BLTQMD012MD  964H BARR TELL USA, INC. 238   2017-01-21   
667-240 2 BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2017-01-22   
667-240 3 CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2017-01-25   
667-240 4 CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2017-01-25   
667-240 5 CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2017-05-29   
667-240 6 CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2017-09-05   
667-240 7 CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2018-04-23   
667-240 8 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2018-05-27   
667-240 9 CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2017-09-19   
667-257 A BLTMMDCHXQX  197D VONAGE AMERICA LLC 238      
667-257 0 BLTMMDCHXQX  197D VONAGE AMERICA LLC 238   2018-12-29   
667-257 1 BLTMMDCHXQX  197D VONAGE AMERICA LLC 238   2018-12-29   
667-257 2 BLTMMDCHXQX  197D VONAGE AMERICA LLC 238   2018-12-29   
667-257 3 BLTMMDCHXQX  197D VONAGE AMERICA LLC 238   2018-12-29   
667-257 4 BLTMMDCHXQX  197D VONAGE AMERICA LLC 238   2018-12-30   
667-257 5 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2022-10-16   

<< 1 2 3 4 5 >>

Last updated: Thu, 16 Oct 2025 03:04:18 UTC

Sponsored by: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.