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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
443-732 4 Silver Run MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2019-03-29   
443-732 5 Silver Run MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2011-06-23   
443-732 6 Silver Run MD   318J COMCAST IP PHONE, LLC 238   2007-01-19   
443-732 7 Silver Run MD   568G PEERLESS NETWORK OF MARYLAND, LLC 238   2013-05-04   
443-732 8 Silver Run MD   568G PEERLESS NETWORK OF MARYLAND, LLC 238   2013-05-04   
443-732 9 Silver Run MD   7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238      
443-733 A Waterloo MD CLMAMDNIDS1  7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238      
443-733 0 Waterloo MD   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238   2003-02-16   
443-733 1 Waterloo MD   829J PAETEC ITEL, LLC 238   2003-03-04   
443-733 2 Waterloo MD   829J PAETEC ITEL, LLC 238   2009-03-17   
443-733 3 Waterloo MD   7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 238   2008-10-01   
443-733 4 Waterloo MD   876D ONVOY, LLC - MD 238   2016-04-28   
443-733 5 Waterloo MD   829J PAETEC ITEL, LLC 238   2013-10-10   
443-733 6 Waterloo MD   876D ONVOY, LLC - MD 238   2016-04-28   
443-733 7 Waterloo MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2019-05-02   
443-733 8 Waterloo MD   515J IP HORIZON LLC 238   2016-05-31   
443-733 9 Waterloo MD   7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238      
443-734 A Severn MD ODTNMDONDS0  9212 VERIZON MARYLAND, INC. 238      
443-734 0 Severn MD   515J IP HORIZON LLC 238   2013-09-06   
443-734 1 Severn MD   876D ONVOY, LLC - MD 238   2014-09-06   
443-734 2 Severn MD   5562 METROPCS, INC. 238   2015-03-06   
443-734 3 Severn MD   876D ONVOY, LLC - MD 238   2016-01-22   
443-734 4 Severn MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2018-04-02   
443-734 5 Severn MD   5562 METROPCS, INC. 238   2015-03-13   
443-734 6 Severn MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2018-11-11   
443-734 7 Severn MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2017-05-29   
443-734 8 Severn MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2017-05-29   
443-734 9 Severn MD   9212 VERIZON MARYLAND, INC. 238      
443-735 A Salisbury MD SLBRMDSCXLX  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 242      
443-736 A Salisbury MD SLBRMDSCXLX  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 242      
443-736 0 Salisbury MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 242      
443-736 1 Salisbury MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 242   2013-07-21   
443-736 2 Salisbury MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 242   2011-04-16   
443-736 3 Salisbury MD   318J COMCAST IP PHONE, LLC 242   2008-03-26   
443-736 4 Salisbury MD   318J COMCAST IP PHONE, LLC 242   2008-03-26   
443-736 5 Salisbury MD   5562 METROPCS, INC. 242   2011-10-11   
443-736 6 Salisbury MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 242   2010-05-03   
443-736 7 Salisbury MD   318J COMCAST IP PHONE, LLC 242   2007-10-29   
443-736 8 Salisbury MD   318J COMCAST IP PHONE, LLC 242   2007-10-29   
443-736 9 Salisbury MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 242      
443-737 A Waterloo MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-737 0 Waterloo MD   829J PAETEC ITEL, LLC 238      
443-737 1 Waterloo MD   829J PAETEC ITEL, LLC 238      
443-737 2 Waterloo MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2005-07-16   
443-737 3 Waterloo MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2019-05-02   
443-737 4 Waterloo MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2004-02-07   
443-737 5 Waterloo MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2019-05-02   
443-737 6 Waterloo MD   876D ONVOY, LLC - MD 238   2016-03-21   
443-737 7 Waterloo MD   876D ONVOY, LLC - MD 238   2016-03-21   
443-737 8 Waterloo MD   515J IP HORIZON LLC 238   2015-03-21   

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

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