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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
443-636 5 Catonsville MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2007-08-13   
443-636 6 Catonsville MD BLTMMDSNDS6  281E YMAX COMMUNICATIONS CORP. - MD 238   2007-08-20   
443-636 7 Catonsville MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2008-07-17   
443-636 8 Catonsville MD BLTMMDSNDS6  281E YMAX COMMUNICATIONS CORP. - MD 238   2008-07-27   
443-636 9 Catonsville MD BLTMMDSNDS6  281E YMAX COMMUNICATIONS CORP. - MD 238   2008-07-27   
443-637 A Armiger-Gibson Island MD BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-637 0 Armiger-Gibson Island MD BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-637 1 Armiger-Gibson Island MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2005-01-10   
443-637 2 Armiger-Gibson Island MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2010-11-29   
443-637 3 Armiger-Gibson Island MD BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-637 4 Armiger-Gibson Island MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2003-02-20   
443-637 5 Armiger-Gibson Island MD BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-637 6 Armiger-Gibson Island MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2012-10-07   
443-637 7 Armiger-Gibson Island MD BLTQMD01DS0  568G PEERLESS NETWORK OF MARYLAND, LLC 238   2012-10-11   
443-637 8 Armiger-Gibson Island MD BLTQMD01DS0  568G PEERLESS NETWORK OF MARYLAND, LLC 238   2012-10-11   
443-637 9 Armiger-Gibson Island MD BLTQMD01DS0  568G PEERLESS NETWORK OF MARYLAND, LLC 238   2012-10-11   
443-638 A Ellicott City MD BLTMMDDN4MD  2554 GLOBAL NAPS SOUTH, INC. - MD 238      
443-639 A Hampstead MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-639 0 Hampstead MD BLTMMDCHX7X  073H TELNYX LLC 238   2017-04-26   
443-639 1 Hampstead MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2024-05-23   
443-639 2 Hampstead MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2017-07-07   
443-639 3 Hampstead MD   829J PAETEC ITEL, LLC 238      
443-639 4 Hampstead MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2015-06-04   
443-639 5 Hampstead MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2015-04-02   
443-639 6 Hampstead MD BLTMMDCH25Z  8697 BALTIMORE-WASHINGTON TELEPHONE (BWT) 238   2015-06-13   
443-639 7 Hampstead MD BLTMMDDN2MD  508J CENTURYLINK COMMUNICATIONS, LLC 238   2014-06-12   
443-639 8 Hampstead MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2014-10-21   
443-639 9 Hampstead MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2014-10-21   
443-640 A Bel Air MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-640 0 Bel Air MD   829J PAETEC ITEL, LLC 238      
443-640 1 Bel Air MD   829J PAETEC ITEL, LLC 238      
443-640 2 Bel Air MD   829J PAETEC ITEL, LLC 238      
443-640 3 Bel Air MD   829J PAETEC ITEL, LLC 238      
443-640 4 Bel Air MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2008-04-30   
443-640 5 Bel Air MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2009-02-02   
443-640 6 Bel Air MD BLTMMDCH47Z  420C ARMSTRONG TELECOMMUNICATIONS, INC. - MD 238   2008-09-08   
443-640 7 Bel Air MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2012-03-16   
443-640 8 Bel Air MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2008-04-21   
443-640 9 Bel Air MD BLTMMDCHX7X  073H TELNYX LLC 238   2021-03-04   
443-641 A Pikesville MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-641 0 Pikesville MD BLTQMD01DS0  568G PEERLESS NETWORK OF MARYLAND, LLC 238   2013-05-04   
443-641 1 Pikesville MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-641 2 Pikesville MD OWMLMDOMDS0  9212 VERIZON MARYLAND, INC. 238   2004-10-10   
443-641 3 Pikesville MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2011-08-05   
443-641 4 Pikesville MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2011-08-05   
443-641 5 Pikesville MD OWMLMDOMDS0  9212 VERIZON MARYLAND, INC. 238   2004-10-10   
443-641 6 Pikesville MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2011-11-28   
443-641 7 Pikesville MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2011-11-28   
443-641 8 Pikesville MD BLTQMD01DS0  568G PEERLESS NETWORK OF MARYLAND, LLC 238   2013-05-04   
443-641 9 Pikesville MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-642 A Baltimore MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
443-642 0 Baltimore MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2007-01-06   
443-642 1 Baltimore MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2007-03-11   
443-642 2 Baltimore MD BLTMMDCHDS2  9212 VERIZON MARYLAND, INC. 238   2007-01-08   
443-642 3 Baltimore MD BLTMMDCHDS2  9212 VERIZON MARYLAND, INC. 238   2007-01-08   
443-642 4 Baltimore MD BLTMMDCHDS2  9212 VERIZON MARYLAND, INC. 238   2007-01-08   
443-642 5 Baltimore MD BLTMMDCHDS2  9212 VERIZON MARYLAND, INC. 238   2007-01-08   
443-642 6 Baltimore MD BLTMMDCHDS2  9212 VERIZON MARYLAND, INC. 238   2007-01-08   
443-642 7 Baltimore MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2007-03-24   
443-642 8 Baltimore MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2007-03-24   
443-642 9 Baltimore MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2007-03-24   
443-643 A Bel Air MD BLARMDBLDS0  9212 VERIZON MARYLAND, INC. 238      
443-643 0 Bel Air MD BLTQMD01DS0  568G PEERLESS NETWORK OF MARYLAND, LLC 238   2013-05-04   
443-643 1 Bel Air MD BLARMDBLDS0  9212 VERIZON MARYLAND, INC. 238      
443-643 2 Bel Air MD BLARMDBLDS0  9212 VERIZON MARYLAND, INC. 238      
443-643 3 Bel Air MD BLARMDBLDS0  9212 VERIZON MARYLAND, INC. 238      
443-643 4 Bel Air MD BLARMDBLDS0  9212 VERIZON MARYLAND, INC. 238      
443-643 5 Bel Air MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2006-04-08   
443-643 6 Bel Air MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2006-04-08   
443-643 7 Bel Air MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2006-04-08   
443-643 8 Bel Air MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2006-04-08   
443-643 9 Bel Air MD BLTQMD01DS0  568G PEERLESS NETWORK OF MARYLAND, LLC 238   2013-05-04   
443-644 A Jarrettsville MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-644 1 Jarrettsville MD   829J PAETEC ITEL, LLC 238      
443-644 2 Jarrettsville MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2018-10-22   
443-644 3 Jarrettsville MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2018-06-16   
443-644 4 Jarrettsville MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2018-06-16   
443-644 6 Jarrettsville MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2018-10-22   
443-644 7 Jarrettsville MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2018-10-22   
443-645 A Millersville MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-645 0 Millersville MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2021-12-04   
443-645 1 Millersville MD   829J PAETEC ITEL, LLC 238      
443-645 2 Millersville MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2019-03-29   
443-645 3 Millersville MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2015-04-17   
443-645 4 Millersville MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2016-03-24   
443-645 5 Millersville MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2016-03-24   
443-645 6 Millersville MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2016-10-20   
443-645 7 Millersville MD BLTQMD012MD  964H BARR TELL USA, INC. 238   2016-12-17   
443-645 8 Millersville MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2018-05-31   
443-645 9 Millersville MD BLTMMDCHX7X  073H TELNYX LLC 238   2017-04-26   
443-646 A North Beach MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-646 1 North Beach MD   829J PAETEC ITEL, LLC 238      
443-646 2 North Beach MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2016-12-02   
443-646 3 North Beach MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2015-06-04   
443-646 4 North Beach MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2016-03-23   
443-646 5 North Beach MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2014-05-01   
443-646 6 North Beach MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2015-08-05   
443-646 7 North Beach MD BLTMMDDN2MD  508J CENTURYLINK COMMUNICATIONS, LLC 238   2014-06-12   
443-646 8 North Beach MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2016-03-23   
443-646 9 North Beach MD BLTMMDCHX7X  073H TELNYX LLC 238   2017-04-26   

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Last updated: Wed, 18 Jun 2025 02:30:00 UTC

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