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.

Gaithersburg, MD

1 2 3 4 5 6 7 >>

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
227-227 A VINNVACBDS0  876D ONVOY, LLC - MD 236   2024-03-30   
227-227 0 VINNVACBDS0  876D ONVOY, LLC - MD 236   2024-03-30   
227-227 1 VINNVACBDS0  876D ONVOY, LLC - MD 236   2024-03-30   
227-227 2 VINNVACBDS0  876D ONVOY, LLC - MD 236   2024-03-31   
227-227 3 WASHDCSWMMD  624H ONVOY SPECTRUM, LLC 236   2024-07-06   
227-227 4 WASHDCSWMMD  624H ONVOY SPECTRUM, LLC 236   2024-07-06   
227-227 5 WASHDCSWMMD  624H ONVOY SPECTRUM, LLC 236   2024-07-06   
227-227 6 VINNVACBDS0  876D ONVOY, LLC - MD 236   2024-04-13   
227-227 7 WASHDC12KMD  145J TERRA NOVA TELECOM INC. 236   2024-04-21   
227-227 8 VINNVACBDS0  876D ONVOY, LLC - MD 236   2024-04-04   
227-227 9 VINNVACBDS0  876D ONVOY, LLC - MD 236   2024-04-04   
227-245 A VINNVACBDS0  876D ONVOY, LLC - MD 236   2024-08-04   
227-245 0 VINNVACBDS0  876D ONVOY, LLC - MD 236   2024-08-04   
227-245 1 BTVLMD18G00  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2024-09-29   
227-245 2 WASHDC12NMD  490J DISH WIRELESS, LLC 236   2024-10-24   
227-245 3 WASHDC12NMD  490J DISH WIRELESS, LLC 236   2025-01-20   
227-245 4 WASHDC12NMD  490J DISH WIRELESS, LLC 236   2025-03-21   
227-245 5 WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2024-09-27   
227-245 6 BTVLMD18G00  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2024-11-17   
227-245 7 WASHDCDP8MD  071F BANDWIDTH.COM CLEC, LLC - MD 236   2024-10-06   
227-245 8 WASHDCDP8MD  071F BANDWIDTH.COM CLEC, LLC - MD 236   2024-10-06   
227-245 9 WASHDCDP8MD  071F BANDWIDTH.COM CLEC, LLC - MD 236   2024-10-06   
227-258 A BTVLMD18GT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2024-12-22   
227-258 0 WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2024-12-23   
227-258 1 VINNVACBDS0  876D ONVOY, LLC - MD 236   2025-01-06   
227-258 8 BTVLMD18GT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2024-12-22   
227-258 9 BTVLMD18GT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2024-12-22   
240-224 A WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236      
240-224 0 WASHDCDP8MD  071F BANDWIDTH.COM CLEC, LLC - MD 236   2013-06-19   
240-224 1 BTVLMD12CMA  5562 METROPCS, INC. 236   2014-06-05   
240-224 2 WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2013-06-02   
240-224 3 WASHDCDP8MD  071F BANDWIDTH.COM CLEC, LLC - MD 236   2013-06-16   
240-224 4 WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2013-08-01   
240-224 5 BTVLMD12CMA  5562 METROPCS, INC. 236   2013-06-14   
240-224 6 BTVLMD12CMA  5562 METROPCS, INC. 236   2013-06-14   
240-224 7 ARTNVAARXDY  318J COMCAST IP PHONE, LLC 236   2013-04-10   
240-224 8 SLSPMD91DS0  568G PEERLESS NETWORK OF MARYLAND, LLC 236   2013-05-03   
240-224 9 SLSPMD91DS0  568G PEERLESS NETWORK OF MARYLAND, LLC 236   2013-05-03   
240-243 A WASKDCFNPS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
240-243 0 WASKDCFNPS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
240-243 1 WASKDCFNPS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
240-243 2 WASKDCFNPS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
240-243 3 BTVLMD18GT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2014-09-19   
240-243 4 WASKDCFNPS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
240-243 5 BTVLMD18G00  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2022-11-18   
240-243 6 ARTNVAARXDY  318J COMCAST IP PHONE, LLC 236   2018-11-21   
240-243 7 BTVLMD18GT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2019-01-22   
240-243 8 BTVLMD18G00  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2023-07-11   
240-243 9 WASKDCFNPS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
240-246 A LNHMMDADGT0  8832 STARPOWER COMMUNICATIONS, LLC - MD 236      
240-246 0 LNHMMDADGT0  8832 STARPOWER COMMUNICATIONS, LLC - MD 236      
240-246 1 LNHMMDADGT0  8832 STARPOWER COMMUNICATIONS, LLC - MD 236      
240-246 2 LNHMMDADGT0  8832 STARPOWER COMMUNICATIONS, LLC - MD 236      
240-246 3 BTVLMD12CMA  5562 METROPCS, INC. 236   2005-07-02   
240-246 4 BTVLMD18GT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2005-01-03   
240-246 5 BTVLMD18GT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2005-01-03   
240-246 6 BTVLMD18GT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2005-01-03   
240-246 7 ARTNVAARXDY  318J COMCAST IP PHONE, LLC 236   2005-07-25   
240-246 8 LNHMMDADGT0  8832 STARPOWER COMMUNICATIONS, LLC - MD 236      
240-246 9 LNHMMDADGT0  8832 STARPOWER COMMUNICATIONS, LLC - MD 236      
240-252 A MCLNVA23DS4  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236      
240-252 0 BTVLMD18GT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2004-03-03   
240-252 1 MCLNVA23DS4  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236   2005-03-18   
240-252 2 MCLNVA23DS4  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236   2011-02-03   
240-252 3 MCLNVA23DS4  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236   2005-03-18   
240-252 4 MCLNVA23DS4  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236      
240-252 5 MCLNVA23DS4  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236   2005-03-18   
240-252 6 MCLNVA23DS4  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236   2005-03-18   
240-252 7 MCLNVA23DS4  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236   2005-03-18   
240-252 8 BTVLMD18GT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2006-09-18   
240-252 9 BTVLMD18GT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2004-03-03   
240-261 A VINNVACBDS0  876D ONVOY, LLC - MD 236      
240-261 0 VINNVACBDS0  876D ONVOY, LLC - MD 236   2016-02-25   
240-261 1 VINNVACBDS0  876D ONVOY, LLC - MD 236   2016-02-25   
240-261 2 VINNVACBDS0  876D ONVOY, LLC - MD 236   2016-02-25   
240-261 3 BTVLMD12CMA  5562 METROPCS, INC. 236   2016-03-26   
240-261 4 ARTNVAARXDY  318J COMCAST IP PHONE, LLC 236   2016-04-25   
240-261 5 VINNVACBDS0  876D ONVOY, LLC - MD 236   2017-05-18   
240-261 6 ARTNVAARXDY  318J COMCAST IP PHONE, LLC 236   2016-08-12   
240-261 7 WASHDCDP8MD  071F BANDWIDTH.COM CLEC, LLC - MD 236   2016-09-19   
240-261 8 WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2018-07-09   
240-261 9   515J IP HORIZON LLC 236   2016-05-31   
240-306 A WASKDCFNPS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
240-306 0 WASKDCFNPS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
240-306 1 WASKDCFNPS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
240-306 2 WASKDCFNPS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
240-306 3 WASKDCFNPS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
240-306 4 BTVLMD18G00  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2022-11-18   
240-306 5 WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2017-09-19   
240-306 6 BTVLMD12CMA  5562 METROPCS, INC. 236   2018-07-24   
240-306 7 BTVLMD18G00  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2019-10-22   
240-306 8 BTVLMD18G00  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2019-10-22   
240-306 9 WASKDCFNPS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
240-327 A CHCHMDBEPS0  2593 CORE COMMUNICATIONS, INC.- MD 236   2024-01-16   
240-361 A HRNDVA13AMD  3910 CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 236      
240-361 0 HRNDVA13AMD  3910 CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 236      
240-361 1 HRNDVA13AMD  3910 CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 236      
240-361 2 HRNDVA13AMD  3910 CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 236      
240-361 3 HRNDVA13AMD  3910 CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 236      
240-361 4 HRNDVA13AMD  3910 CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 236      

1 2 3 4 5 6 7 >>

Last updated: Sun, 26 Jan 2025 15:59:20 UTC

Sponsored by: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.