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
301-370 3 BTVLMD12CMA  5562 METROPCS, INC. 236      
301-370 4 BTVLMD12CMA  5562 METROPCS, INC. 236      
301-370 5 BTVLMD12CMA  5562 METROPCS, INC. 236      
301-370 6 BTVLMD12CMA  5562 METROPCS, INC. 236      
301-370 7 BTVLMD12CMA  5562 METROPCS, INC. 236      
301-370 8 BTVLMD12CMA  5562 METROPCS, INC. 236      
301-370 9 BTVLMD12CMA  5562 METROPCS, INC. 236      
301-407 A PLVLMDPVRS2  9212 VERIZON MARYLAND, INC. 236      
301-407 0 PLVLMDPVRS2  9212 VERIZON MARYLAND, INC. 236      
301-407 1 ARTNVAARXDY  318J COMCAST IP PHONE, LLC 236   2011-06-10   
301-407 2 MCLNVA23DS4  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236   2014-10-23   
301-407 3 BTVLMD12CMA  5562 METROPCS, INC. 236   2005-07-14   
301-407 4 GTBGMDGBPS0  9212 VERIZON MARYLAND, INC. 236   2003-05-10   
301-407 5 BTVLMD12CMA  5562 METROPCS, INC. 236   2006-05-05   
301-407 6 CHCHMDBE6MD  4716 PAETEC COMMUNICATIONS, INC. - MD 236   2011-10-13   
301-407 7 BTVLMD12CMA  5562 METROPCS, INC. 236   2005-12-29   
301-407 8 BTVLMD12CMA  5562 METROPCS, INC. 236   2006-05-05   
301-407 9 PLVLMDPVRS2  9212 VERIZON MARYLAND, INC. 236      
301-515 A GMTWMDGNDS0  9212 VERIZON MARYLAND, INC. 236      
301-519 A GTBGMDGBPS0  9212 VERIZON MARYLAND, INC. 236      
301-525 A LARLMDLR3MD  2596 QUANTUM TELECOMMUNICATIONS, INC. - MD 236      
301-525 0 LARLMDLR3MD  2596 QUANTUM TELECOMMUNICATIONS, INC. - MD 236   2003-12-07   
301-525 1 WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2008-06-05   
301-525 2 WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2008-08-14   
301-525 3 WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2008-10-03   
301-525 4 WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2008-02-15   
301-525 5 WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2008-02-15   
301-525 6 WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2008-07-03   
301-525 7 WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2008-11-03   
301-525 8 WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2008-11-17   
301-525 9 WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2008-12-19   
301-527 A GTBGMDGBPS0  9212 VERIZON MARYLAND, INC. 236      
301-528 A GMTWMDGNDS0  9212 VERIZON MARYLAND, INC. 236      
301-540 A GMTWMDGNDS0  9212 VERIZON MARYLAND, INC. 236      
301-556 A WASHDCTTDS0  7529 TELEPORT COMMUNICATIONS AMERICA, LLC - DC 236      
301-556 0 WASHDCTTDS0  7529 TELEPORT COMMUNICATIONS AMERICA, LLC - DC 236      
301-556 1 WASHDCTTDS0  7529 TELEPORT COMMUNICATIONS AMERICA, LLC - DC 236      
301-556 2 WASHDCTTDS0  7529 TELEPORT COMMUNICATIONS AMERICA, LLC - DC 236      
301-556 3 BTVLMD12CMA  5562 METROPCS, INC. 236   2004-11-18   
301-556 4 WASHDCTTDS0  7529 TELEPORT COMMUNICATIONS AMERICA, LLC - DC 236      
301-556 5 LARLMDCCDS0  4492 VDL, INC. DBA GLOBAL TELECOM BROKERS - MD 236   2004-05-06   
301-556 6 BTVLMD12CMA  5562 METROPCS, INC. 236   2004-02-28   
301-556 7 BTVLMD12CMA  5562 METROPCS, INC. 236   2004-02-28   
301-556 8 BTVLMD12CMA  5562 METROPCS, INC. 236   2005-11-13   
301-556 9 WASHDCTTDS0  7529 TELEPORT COMMUNICATIONS AMERICA, LLC - DC 236      
301-569 A WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236      
301-569 0 WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2013-09-17   
301-569 1 WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2014-05-01   
301-569 2 WASHDCDP8MD  071F BANDWIDTH.COM CLEC, LLC - MD 236   2011-05-07   
301-569 3 WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2014-06-01   
301-569 4 ARTNVAARXDY  318J COMCAST IP PHONE, LLC 236   2013-12-10   
301-569 5 WASIDCRG7MD  508J CENTURYLINK COMMUNICATIONS, LLC 236   2013-10-01   
301-569 6 ARTNVAARXDY  318J COMCAST IP PHONE, LLC 236   2011-09-08   
301-569 7 ARTNVAARXDY  318J COMCAST IP PHONE, LLC 236   2012-01-14   
301-569 8 WASLDCRGDS0  281E YMAX COMMUNICATIONS CORP. - MD 236   2011-09-02   
301-569 9 VINNVACBDS0  876D ONVOY, LLC - MD 236   2012-04-05   
301-591 A CHCHMDBE6MD  4716 PAETEC COMMUNICATIONS, INC. - MD 236      
301-591 0 CHCHMDBE6MD  4716 PAETEC COMMUNICATIONS, INC. - MD 236      
301-591 1 CHCHMDBE6MD  4716 PAETEC COMMUNICATIONS, INC. - MD 236      
301-591 2 CHCHMDBE6MD  4716 PAETEC COMMUNICATIONS, INC. - MD 236      
301-591 3 CHCHMDBE6MD  4716 PAETEC COMMUNICATIONS, INC. - MD 236      
301-591 4 CHCHMDBE6MD  4716 PAETEC COMMUNICATIONS, INC. - MD 236      
301-591 5 CHCHMDBE6MD  4716 PAETEC COMMUNICATIONS, INC. - MD 236      
301-591 6 SLSPMD91DS0  568G PEERLESS NETWORK OF MARYLAND, LLC 236   2020-04-19   
301-591 7 VINNVACBDS0  876D ONVOY, LLC - MD 236   2021-02-18   
301-591 8 CHCHMDBE6MD  4716 PAETEC COMMUNICATIONS, INC. - MD 236      
301-591 9 CHCHMDBE6MD  4716 PAETEC COMMUNICATIONS, INC. - MD 236      
301-740 A GTBGMDGBPS0  9212 VERIZON MARYLAND, INC. 236      
301-740 0 BTVLMD12CMA  5562 METROPCS, INC. 236   2004-11-29   
301-740 1 GTBGMDGBPS0  9212 VERIZON MARYLAND, INC. 236   2004-07-02   
301-740 2 GTBGMDGBPS0  9212 VERIZON MARYLAND, INC. 236   2004-07-02   
301-740 3 GTBGMDGBPS0  9212 VERIZON MARYLAND, INC. 236   2004-07-02   
301-740 4 BTVLMD12CMA  5562 METROPCS, INC. 236   2005-04-07   
301-740 5 BTVLMD12CMA  5562 METROPCS, INC. 236   2006-02-05   
301-740 6 WASLDCRGDS0  281E YMAX COMMUNICATIONS CORP. - MD 236   2011-09-02   
301-740 7 GTBGMDGBPS0  9212 VERIZON MARYLAND, INC. 236   2006-03-30   
301-740 8 GTBGMDGBPS0  9212 VERIZON MARYLAND, INC. 236   2006-03-30   
301-740 9 GTBGMDGBPS0  9212 VERIZON MARYLAND, INC. 236   2006-03-30   
301-820 A WASHDCTTDS0  7529 TELEPORT COMMUNICATIONS AMERICA, LLC - DC 236      
301-820 0 BTVLMD18GT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2012-02-23   
301-820 1 BTVLMD18GT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2012-02-23   
301-820 2 BTVLMD18GT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2010-09-14   
301-820 3 WASHDCMTX7X  2697 CTC COMMUNICATIONS CORP. - MD 236   2011-05-27   
301-820 4 WASHDCTTDS0  7529 TELEPORT COMMUNICATIONS AMERICA, LLC - DC 236      
301-820 5 BTVLMD18GT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2009-11-04   
301-820 6 WASHDCTTDS0  7529 TELEPORT COMMUNICATIONS AMERICA, LLC - DC 236      
301-820 7 VINNVACBDS0  876D ONVOY, LLC - MD 236   2011-06-17   
301-820 8 BTVLMD18GT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 236   2012-02-23   
301-820 9 WASHDCSWMMD  624H ONVOY SPECTRUM, LLC 236   2022-01-07   
301-869 A GTBGMDGBPS0  9212 VERIZON MARYLAND, INC. 236      
301-916 A GMTWMDGNDS0  9212 VERIZON MARYLAND, INC. 236      
301-926 A GTBGMDGBPS0  9212 VERIZON MARYLAND, INC. 236      
301-944 A WASHDCINDS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
301-944 0 WASHDCINDS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
301-944 1 WASHDCINDS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
301-944 2 WASHDCINDS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
301-944 3 WASHDCINDS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236   2008-05-30   
301-944 4 WASKDCFNAMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 236   2011-06-27   
301-944 5 WASHDCINDS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
301-944 6 WASHDCINDS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      

<< 1 2 3 4 5 6 7 >>

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

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.