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.

Washington Zone 6, MD

<< 1 2 3

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
301-485 1 ARTNVAARXDY  318J COMCAST IP PHONE, LLC 236      
301-485 2 VINNVACBDS0  876D ONVOY, LLC - MD 236   2016-03-02   
301-485 3 HRNDVACKBMD  9170 BROADVIEW NETWORKS, INC. - MD 236   2015-09-04   
301-485 4 VINNVACBDS0  876D ONVOY, LLC - MD 236   2016-04-28   
301-485 5 VINNVACBDS0  876D ONVOY, LLC - MD 236   2015-06-27   
301-485 6 WASHDCDP8MD  071F BANDWIDTH.COM CLEC, LLC - MD 236   2010-02-22   
301-485 7 CHCHMDBE6MD  4716 PAETEC COMMUNICATIONS, INC. - MD 236   2006-09-02   
301-485 8 ARTNVAARXDY  318J COMCAST IP PHONE, LLC 236   2008-04-24   
301-485 9 WASHDCDP8MD  071F BANDWIDTH.COM CLEC, LLC - MD 236   2008-12-13   
301-505 A TMHLMDTHDS0  9212 VERIZON MARYLAND, INC. 236      
301-521 A OXHLMDOHDS0  9212 VERIZON MARYLAND, INC. 236      
301-567 A OXHLMDOHDS0  9212 VERIZON MARYLAND, INC. 236      
301-630 A TMHLMDTHDS0  9212 VERIZON MARYLAND, INC. 236      
301-686 A OXHLMDOHDS0  9212 VERIZON MARYLAND, INC. 236      
301-686 0 OXHLMDOHDS0  9212 VERIZON MARYLAND, INC. 236      
301-686 1 OXHLMDOHDS0  9212 VERIZON MARYLAND, INC. 236      
301-686 2 OXHLMDOHDS0  9212 VERIZON MARYLAND, INC. 236   2005-09-29   
301-686 3 WASKDCFNPS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236   2008-10-01   
301-686 4 BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2008-10-12   
301-686 5 VINNVACBDS0  876D ONVOY, LLC - MD 236   2016-04-28   
301-686 6 BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2024-11-18   
301-686 7 WASHDCDP8MD  071F BANDWIDTH.COM CLEC, LLC - MD 236   2010-06-26   
301-686 8 WASKDCFNPS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236   2009-08-28   
301-686 9 OXHLMDOHDS0  9212 VERIZON MARYLAND, INC. 236      
301-747 A WASHDCTTDS0  7529 TELEPORT COMMUNICATIONS AMERICA, LLC - DC 236      
301-747 0 WASHDC12DS6  568G PEERLESS NETWORK OF MARYLAND, LLC 236   2015-06-06   
301-747 1 WASHDCDP8MD  071F BANDWIDTH.COM CLEC, LLC - MD 236   2010-10-28   
301-747 2   515J IP HORIZON LLC 236   2016-05-31   
301-747 3 WASHDCDP8MD  071F BANDWIDTH.COM CLEC, LLC - MD 236   2010-11-29   
301-747 4 ARTNVAARXDY  318J COMCAST IP PHONE, LLC 236   2015-10-02   
301-747 5 BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2008-06-16   
301-747 6 WASHDCDP8MD  071F BANDWIDTH.COM CLEC, LLC - MD 236   2010-08-19   
301-747 7 WASHDCDP8MD  071F BANDWIDTH.COM CLEC, LLC - MD 236   2010-08-19   
301-747 8 BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2011-02-07   
301-747 9 WASHDCTTDS0  7529 TELEPORT COMMUNICATIONS AMERICA, LLC - DC 236      
301-749 A OXHLMDOHDS0  9212 VERIZON MARYLAND, INC. 236      
301-753 A LPLTMDLADS0  9212 VERIZON MARYLAND, INC. 236      
301-753 0 BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2023-09-29   
301-753 1 LPLTMDLADS0  9212 VERIZON MARYLAND, INC. 236      
301-753 2 LPLTMDLADS0  9212 VERIZON MARYLAND, INC. 236      
301-753 3 VINNVACBDS0  876D ONVOY, LLC - MD 236   2020-12-03   
301-753 4 LPLTMDLADS0  9212 VERIZON MARYLAND, INC. 236      
301-753 5 LPLTMDLADS0  9212 VERIZON MARYLAND, INC. 236      
301-753 6 LPLTMDLADS0  9212 VERIZON MARYLAND, INC. 236      
301-753 7 ARTNVAARXDY  318J COMCAST IP PHONE, LLC 236   2017-04-14   
301-753 8 VINNVACBDS0  876D ONVOY, LLC - MD 236   2020-12-03   
301-753 9 LPLTMDLADS0  9212 VERIZON MARYLAND, INC. 236      
301-839 A OXHLMDOHDS0  9212 VERIZON MARYLAND, INC. 236      
301-843 A WDRFMDWDDS0  9212 VERIZON MARYLAND, INC. 236      
301-870 A WDRFMDWDDS0  9212 VERIZON MARYLAND, INC. 236      
301-893 A WDRFMDWDDS0  9212 VERIZON MARYLAND, INC. 236      
301-893 0 WDRFMDWDDS0  9212 VERIZON MARYLAND, INC. 236      
301-893 1 WDRFMDWDDS0  9212 VERIZON MARYLAND, INC. 236      
301-893 2 WDRFMDWDDS0  9212 VERIZON MARYLAND, INC. 236      
301-893 3 WDRFMDWDDS0  9212 VERIZON MARYLAND, INC. 236      
301-893 4 WASHDCDP8MD  071F BANDWIDTH.COM CLEC, LLC - MD 236   2011-05-20   
301-893 5 BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2016-08-15   
301-893 6 WDRFMDWDDS0  9212 VERIZON MARYLAND, INC. 236      
301-893 7 WASHDCDP8MD  071F BANDWIDTH.COM CLEC, LLC - MD 236   2011-05-20   
301-893 8 WDRFMDWDDS0  9212 VERIZON MARYLAND, INC. 236      
301-893 9   145J TERRA NOVA TELECOM INC. 236   2021-06-10   
301-894 A TMHLMDTHDS0  9212 VERIZON MARYLAND, INC. 236      
301-965 A WASHDCINDS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
301-965 0 WASHDCDP8MD  071F BANDWIDTH.COM CLEC, LLC - MD 236   2011-08-20   
301-965 1 VINNVACBDS0  876D ONVOY, LLC - MD 236   2008-10-05   
301-965 2 MCLNVA23DS4  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236   2007-04-27   
301-965 3 MCLNVA23DS4  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236   2007-04-27   
301-965 4 OXHLMDOHDS0  9212 VERIZON MARYLAND, INC. 236   2007-04-27   
301-965 5 MCLNVA23DS4  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 236   2007-04-27   
301-965 6 VINNVACBDS0  876D ONVOY, LLC - MD 236   2016-12-18   
301-965 7 WASHDCMTX7X  2697 CTC COMMUNICATIONS CORP. - MD 236   2010-07-28   
301-965 8 WASHDC12DS6  568G PEERLESS NETWORK OF MARYLAND, LLC 236   2013-10-25   
301-965 9 WASHDCINDS0  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
301-971 A LNHMMDADGT0  8832 STARPOWER COMMUNICATIONS, LLC - MD 236      
301-971 0 WASHDC12DS6  568G PEERLESS NETWORK OF MARYLAND, LLC 236   2012-09-15   
301-971 1 LARLMDCCDS0  4492 VDL, INC. DBA GLOBAL TELECOM BROKERS - MD 236   2004-04-06   
301-971 2 WASHDCDP8MD  071F BANDWIDTH.COM CLEC, LLC - MD 236   2012-10-19   
301-971 3 HRNDVACKBMD  9170 BROADVIEW NETWORKS, INC. - MD 236   2011-06-12   
301-971 4 WASHDCDP8MD  071F BANDWIDTH.COM CLEC, LLC - MD 236   2012-10-19   
301-971 5 OXHLMDOHDS0  9212 VERIZON MARYLAND, INC. 236   2013-02-25   
301-971 6 OXHLMDOHDS0  9212 VERIZON MARYLAND, INC. 236   2013-02-25   
301-971 7 BTVLMD12CMA  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2015-01-31   
301-971 8 LNHMMDADGT0  8832 STARPOWER COMMUNICATIONS, LLC - MD 236      
301-971 9   515J IP HORIZON LLC 236   2013-09-06   

<< 1 2 3

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

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.