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
667-240 1 BLTQMD012MD  964H BARR TELL USA, INC. 238      
667-240 2 BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238      
667-240 3 CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
667-240 4 CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
667-240 5 CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
667-240 6 CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
667-240 7 CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
667-240 8 BLTMMDCH42Z  876D ONVOY, LLC - MD 238      
667-240 9 CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
667-257 A BLTMMDCHXQX  197D VONAGE AMERICA LLC 238      
667-257 0 BLTMMDCHXQX  197D VONAGE AMERICA LLC 238      
667-257 1 BLTMMDCHXQX  197D VONAGE AMERICA LLC 238      
667-257 2 BLTMMDCHXQX  197D VONAGE AMERICA LLC 238      
667-257 3 BLTMMDCHXQX  197D VONAGE AMERICA LLC 238      
667-257 4 BLTMMDCHXQX  197D VONAGE AMERICA LLC 238      
667-257 5 BLTMMDCH42Z  876D ONVOY, LLC - MD 238      
667-257 6 BLTOMDKHDS0  7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 238      
667-257 7 CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
667-257 8   2593 CORE COMMUNICATIONS, INC.- MD 238      
667-257 9   2593 CORE COMMUNICATIONS, INC.- MD 238      
667-261 A CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
667-261 0 CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
667-261 1 CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
667-261 2 CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
667-261 3 CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
667-261 4 CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
667-261 5 CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
667-261 6 BLTMMDCH42Z  876D ONVOY, LLC - MD 238      
667-261 7 BLTMMDCH42Z  876D ONVOY, LLC - MD 238      
667-261 8 BLTQMD01DS0  568G PEERLESS NETWORK OF MARYLAND, LLC 238      
667-261 9 CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
667-300 A BLTMMD91GT0  2593 CORE COMMUNICATIONS, INC.- MD 238      
667-300 0   2593 CORE COMMUNICATIONS, INC.- MD 238      
667-300 1   2593 CORE COMMUNICATIONS, INC.- MD 238      
667-300 2 BLTMMDCHXQX  197D VONAGE AMERICA LLC 238      
667-300 3   2593 CORE COMMUNICATIONS, INC.- MD 238      
667-300 4 BLTMMDCHXQX  197D VONAGE AMERICA LLC 238      
667-300 5 BLTMMDCHXQX  197D VONAGE AMERICA LLC 238      
667-300 6 BLTMMDCHXQX  197D VONAGE AMERICA LLC 238      
667-300 7 BLTMMDCHXQX  197D VONAGE AMERICA LLC 238      
667-300 8 CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
667-300 9 CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
667-359 A BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238      
667-359 0 BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238      
667-359 1 BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238      
667-359 2 BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238      
667-359 3 BLTMMDCH42Z  876D ONVOY, LLC - MD 238      
667-359 4 BLTMMDCH42Z  876D ONVOY, LLC - MD 238      
667-359 5 BLTQMD01DS0  568G PEERLESS NETWORK OF MARYLAND, LLC 238      
667-359 6 BLTMMDCHXUX  624H ONVOY SPECTRUM, LLC 238      
667-359 7 BLTMMDCHXUX  624H ONVOY SPECTRUM, LLC 238      
667-359 8 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
667-359 9 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
667-421 A BLTMMDCHX7X  073H TELNYX LLC 238      
667-421 0 BLTQMD019MD  490J DISH WIRELESS, LLC 238      
667-421 1 BLTQMD019MD  490J DISH WIRELESS, LLC 238      
667-421 2   876D ONVOY, LLC - MD 238      
667-421 3   876D ONVOY, LLC - MD 238      
667-421 7 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
667-421 8 BLTMMDCHX7X  073H TELNYX LLC 238      
667-421 9 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
667-447 A BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
667-447 0   490J DISH WIRELESS, LLC 238      
667-447 1   490J DISH WIRELESS, LLC 238      
667-447 2   876D ONVOY, LLC - MD 238      
667-447 4 BLTQMD018MD  145J TERRA NOVA TELECOM INC. 238      
667-447 6   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
667-447 7 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
667-447 8   490J DISH WIRELESS, LLC 238      
667-447 9 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
667-678 A BLTMMDCH42Z  876D ONVOY, LLC - MD 238      
667-678 0 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
667-678 1 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
667-678 2 BLTMMDCH42Z  876D ONVOY, LLC - MD 238      
667-678 3 BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238      
667-678 4 BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238      
667-678 5 BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238      
667-678 6 BLTQMD013MD  939H COMMIO, LLC 238      
667-678 7 BLTQMD013MD  939H COMMIO, LLC 238      
667-678 8 BLTQMD013MD  939H COMMIO, LLC 238      
667-678 9 BLTQMD013MD  939H COMMIO, LLC 238      
667-786 A CLMAMDNIDS1  7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238      
667-786 0 BLTMMDCHFMD  5562 METROPCS, INC. 238      
667-786 1 CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
667-786 2 CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
667-786 3 CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
667-786 4 BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
667-786 5 CLMAMDNIDS1  7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238      
667-786 6 CLMAMDNIDS1  7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238      
667-786 7 BLTOMDKHDS0  7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 238      
667-786 8 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
667-786 9 BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      

<< 1 2 3 4 5

Last updated: Wed, 20 Nov 2024 21:20:06 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.