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NPA: 443 [Rate centres in NPA 443] [Dial plan for NPA 443]

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NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
443-291 5 Hampstead MD   876D ONVOY, LLC - MD 238   2024-03-08   
443-291 6 Hampstead MD   318J COMCAST IP PHONE, LLC 238   2005-07-20   
443-291 7 Hampstead MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2006-03-03   
443-291 8 Hampstead MD   876D ONVOY, LLC - MD 238   2016-03-21   
443-291 9 Hampstead MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2008-12-11   
443-292 A Crofton MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-292 0 Crofton MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2004-03-29   
443-292 1 Crofton MD   7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238   2006-07-31   
443-292 2 Crofton MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2011-10-14   
443-292 3 Crofton MD   829J PAETEC ITEL, LLC 238   2007-10-03   
443-292 4 Crofton MD   318J COMCAST IP PHONE, LLC 238   2005-03-10   
443-292 5 Crofton MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2008-01-25   
443-292 6 Crofton MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2010-09-04   
443-292 7 Crofton MD   829J PAETEC ITEL, LLC 238   2010-10-22   
443-292 8 Crofton MD   318J COMCAST IP PHONE, LLC 238   2006-12-29   
443-292 9 Crofton MD   876D ONVOY, LLC - MD 238   2012-06-15   
443-293 A Westminster MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
443-293 0 Westminster MD   876D ONVOY, LLC - MD 238   2025-09-28   
443-293 1 Westminster MD   876D ONVOY, LLC - MD 238   2025-10-30   
443-293 2 Westminster MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2005-01-20   
443-293 3 Westminster MD   829J PAETEC ITEL, LLC 238   2006-07-14   
443-293 4 Westminster MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2026-01-08   
443-293 5 Westminster MD   876D ONVOY, LLC - MD 238   2021-09-23   
443-293 6 Westminster MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2011-09-15   
443-293 7 Westminster MD   318J COMCAST IP PHONE, LLC 238   2008-02-22   
443-293 8 Westminster MD   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238   2007-05-14   
443-294 A West River MD   071F BANDWIDTH.COM CLEC, LLC - MD 238      
443-294 2 West River MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2011-02-27   
443-294 3 West River MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2011-07-02   
443-294 4 West River MD   145J TERRA NOVA TELECOM INC. 238   2025-05-12   
443-294 5 West River MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2021-03-25   
443-294 6 West River MD   318J COMCAST IP PHONE, LLC 238   2013-07-19   
443-294 7 West River MD   876D ONVOY, LLC - MD 238   2012-10-08   
443-294 8 West River MD   568G PEERLESS NETWORK OF MARYLAND, LLC 238   2013-05-04   
443-294 9 West River MD   515J IP HORIZON LLC 238   2015-03-23   
443-295 A Prince Frederick MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-295 0 Prince Frederick MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2004-04-02   
443-295 1 Prince Frederick MD   829J PAETEC ITEL, LLC 238   2004-02-05   
443-295 2 Prince Frederick MD   7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238   2006-07-31   
443-295 3 Prince Frederick MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2008-12-11   
443-295 4 Prince Frederick MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-295 5 Prince Frederick MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2012-07-06   
443-295 6 Prince Frederick MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2005-03-04   
443-295 7 Prince Frederick MD   318J COMCAST IP PHONE, LLC 238   2005-03-10   
443-295 8 Prince Frederick MD   318J COMCAST IP PHONE, LLC 238   2016-06-06   
443-295 9 Prince Frederick MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2008-02-13   
443-296 A Waterloo MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-296 0 Waterloo MD   876D ONVOY, LLC - MD 238   2024-12-02   
443-296 1 Waterloo MD   876D ONVOY, LLC - MD 238   2025-09-28   
443-296 2 Waterloo MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2008-12-11   

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

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