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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
443-448 3 Denton MD ESTNMDES5MD  7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 242   2015-11-02   
443-448 4 Denton MD SLBRMDSBXLX  318J COMCAST IP PHONE, LLC 242   2006-07-31   
443-448 5 Denton MD SLBRMDSBXFX  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 242   2016-10-16   
443-448 6 Denton MD SLBRMDSBXUX  7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 242   2014-06-25   
443-448 7 Denton MD SLBRMDSBXLX  318J COMCAST IP PHONE, LLC 242   2015-03-20   
443-448 8 Denton MD SLBRMDSBXVX  876D ONVOY, LLC - MD 242   2017-04-13   
443-448 9 Denton MD SLBRMD902MD  073H TELNYX LLC 242   2017-09-13   
443-449 A Baltimore MD PIVLMDPKXEX  829J PAETEC ITEL, LLC 238   2025-04-01   
443-449 0 Baltimore MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2007-07-22   
443-449 1 Baltimore MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2007-07-22   
443-449 2 Baltimore MD PIVLMDPKXEX  829J PAETEC ITEL, LLC 238   2007-05-19   
443-449 3 Baltimore MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2008-04-08   
443-449 4 Baltimore MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2008-06-16   
443-449 5 Baltimore MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2007-07-27   
443-449 6 Baltimore MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2007-07-27   
443-449 7 Baltimore MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2007-07-27   
443-449 8 Baltimore MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2007-08-17   
443-449 9 Baltimore MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2007-08-17   
443-450 A Pikesville MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-450 0 Pikesville MD BLTQMD012MD  964H BARR TELL USA, INC. 238   2016-12-17   
443-450 1 Pikesville MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2012-07-29   
443-450 2 Pikesville MD CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2022-10-03   
443-450 3 Pikesville MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2013-07-17   
443-450 4 Pikesville MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-450 5 Pikesville MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2015-09-14   
443-450 6 Pikesville MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2018-02-01   
443-450 7 Pikesville MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2019-07-05   
443-450 8 Pikesville MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2014-12-13   
443-450 9 Pikesville MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2016-01-14   
443-451 A Baltimore MD PIVLMDPKXEX  829J PAETEC ITEL, LLC 238   2025-04-01   
443-452 A Baltimore MD PIVLMDPKXEX  829J PAETEC ITEL, LLC 238   2025-04-01   
443-452 0 Baltimore MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2006-02-07   
443-452 1 Baltimore MD PIVLMDPKXEX  829J PAETEC ITEL, LLC 238   2005-10-30   
443-452 2 Baltimore MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2024-02-24   
443-452 3 Baltimore MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2024-02-24   
443-452 4 Baltimore MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2005-10-31   
443-452 5 Baltimore MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2024-02-24   
443-452 6 Baltimore MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2024-02-24   
443-452 7 Baltimore MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2006-02-03   
443-452 8 Baltimore MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2006-02-03   
443-452 9 Baltimore MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2006-02-03   
443-453 A Baltimore MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238      
443-453 0 Baltimore MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2007-12-03   
443-453 1 Baltimore MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2008-06-16   
443-453 2 Baltimore MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2008-06-16   
443-453 3 Baltimore MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2008-06-16   
443-453 4 Baltimore MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2008-06-16   
443-453 5 Baltimore MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2008-05-16   
443-453 6 Baltimore MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2008-06-16   
443-453 7 Baltimore MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2008-06-16   

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Last updated: Sat, 10 Oct 2026 15:24:20 UTC

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