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.

Armiger-Gibson Island, MD

1 2 >>

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
410-255 A ARMGMDARDS0  9212 VERIZON MARYLAND, INC. 238      
410-317 A BLTOMDKHDS0  7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 238      
410-317 0   624H ONVOY SPECTRUM, LLC 238   2022-01-07   
410-317 1   4492 VDL, INC. DBA GLOBAL TELECOM BROKERS - MD 238   2004-02-14   
410-317 2   2593 CORE COMMUNICATIONS, INC.- MD 238   2004-03-29   
410-317 3   624H ONVOY SPECTRUM, LLC 238   2022-01-07   
410-317 4   7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 238      
410-317 5   318J COMCAST IP PHONE, LLC 238   2007-09-20   
410-317 6   829J PAETEC ITEL, LLC 238   2010-01-07   
410-317 7   2593 CORE COMMUNICATIONS, INC.- MD 238   2008-04-30   
410-317 8   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2008-05-08   
410-317 9   7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 238      
410-360 A ARMGMDARDS0  9212 VERIZON MARYLAND, INC. 238      
410-437 A ARMGMDARDS0  9212 VERIZON MARYLAND, INC. 238      
410-439 A ARMGMDARDS0  9212 VERIZON MARYLAND, INC. 238      
443-305 A   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-305 2   318J COMCAST IP PHONE, LLC 238   2005-03-10   
443-305 3   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2008-05-08   
443-305 5   876D ONVOY, LLC - MD 238   2021-03-04   
443-305 6   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2008-05-16   
443-305 7   071F BANDWIDTH.COM CLEC, LLC - MD 238   2022-09-16   
443-305 8   071F BANDWIDTH.COM CLEC, LLC - MD 238   2010-06-26   
443-305 9   071F BANDWIDTH.COM CLEC, LLC - MD 238   2008-12-11   
443-637 A BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-637 0   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-637 1   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2005-01-10   
443-637 2   071F BANDWIDTH.COM CLEC, LLC - MD 238   2010-11-29   
443-637 3   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-637 4   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2003-02-20   
443-637 5   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-637 6   876D ONVOY, LLC - MD 238   2012-10-07   
443-637 7   568G PEERLESS NETWORK OF MARYLAND, LLC 238   2012-10-11   
443-637 8   568G PEERLESS NETWORK OF MARYLAND, LLC 238   2012-10-11   
443-637 9   568G PEERLESS NETWORK OF MARYLAND, LLC 238   2012-10-11   
443-702 A   829J PAETEC ITEL, LLC 238   2025-04-01   
443-702 0   829J PAETEC ITEL, LLC 238      
443-702 1   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2022-07-25   
443-702 2   318J COMCAST IP PHONE, LLC 238   2014-10-15   
443-702 3   829J PAETEC ITEL, LLC 238      
443-702 4   829J PAETEC ITEL, LLC 238   2007-06-15   
443-702 5   876D ONVOY, LLC - MD 238   2021-09-23   
443-702 6   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2014-02-10   
443-702 7   318J COMCAST IP PHONE, LLC 238   2008-09-25   
443-702 8   876D ONVOY, LLC - MD 238   2021-09-23   
443-702 9   515J IP HORIZON LLC 238   2021-08-15   
443-770 A ARMGMDARDS0  9212 VERIZON MARYLAND, INC. 238      
443-770 0   9212 VERIZON MARYLAND, INC. 238      
443-770 1   829J PAETEC ITEL, LLC 238   2004-01-10   
443-770 2   071F BANDWIDTH.COM CLEC, LLC - MD 238   2011-06-02   
443-770 3   071F BANDWIDTH.COM CLEC, LLC - MD 238   2011-06-02   
443-770 4   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2013-10-11   
443-770 5   9212 VERIZON MARYLAND, INC. 238   2005-12-14   
443-770 6   876D ONVOY, LLC - MD 238   2014-09-05   
443-770 7   508J CENTURYLINK COMMUNICATIONS, LLC 238   2014-06-25   
443-770 8   9212 VERIZON MARYLAND, INC. 238      
443-770 9   9212 VERIZON MARYLAND, INC. 238      
443-781 A BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2024-03-05   
443-781 0   2593 CORE COMMUNICATIONS, INC.- MD 238   2019-04-30   
443-781 1   624H ONVOY SPECTRUM, LLC 238   2022-02-11   
443-781 2   624H ONVOY SPECTRUM, LLC 238   2022-02-11   
443-781 3   318J COMCAST IP PHONE, LLC 238   2018-02-08   
443-781 4   071F BANDWIDTH.COM CLEC, LLC - MD 238   2019-04-20   
443-781 5   876D ONVOY, LLC - MD 238   2021-03-04   
443-781 6   876D ONVOY, LLC - MD 238   2021-03-04   
443-781 7   876D ONVOY, LLC - MD 238   2025-09-28   
443-781 8   876D ONVOY, LLC - MD 238   2019-02-19   
443-781 9   876D ONVOY, LLC - MD 238   2019-02-19   
443-784 A BLTMMDFMDS0  7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238      
443-784 0   515J IP HORIZON LLC 238   2013-09-06   
443-784 1   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2015-01-12   
443-784 2   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2014-04-23   
443-784 3   7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 238   2008-10-01   
443-784 4   7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238   2004-11-15   
443-784 5   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2014-04-23   
443-784 6   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2014-04-23   
443-784 7   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2013-05-23   
443-784 8   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2013-07-24   
443-784 9   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2015-01-12   
443-817 A BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-817 0   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-817 1   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-817 2   318J COMCAST IP PHONE, LLC 238   2006-11-30   
443-817 3   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2015-01-12   
443-817 4   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-817 5   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-817 6   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-817 7   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2022-09-30   
443-817 8   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2015-01-12   
443-817 9   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-818 A BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-818 0   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2014-10-01   
443-818 1   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2014-07-01   
443-818 2   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2014-07-01   
443-818 3   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2014-08-22   
443-818 4   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2014-08-22   
443-818 5   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2006-02-20   
443-818 6   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2006-02-20   
443-818 7   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2014-10-01   
443-818 8   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2013-11-22   
443-818 9   071F BANDWIDTH.COM CLEC, LLC - MD 238   2015-02-13   

1 2 >>

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.