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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
443-731 3 Port Deposit MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2008-11-19   
443-731 4 Port Deposit MD BLTOMDKHDS0  7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 238   2017-08-03   
443-731 5 Port Deposit MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2018-06-16   
443-731 6 Port Deposit MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2008-12-11   
443-731 7 Port Deposit MD BLTMMDCHXVX  321J HD CARRIER LLC 238   2016-05-14   
443-731 8 Port Deposit MD   145J TERRA NOVA TELECOM INC. 238   2024-02-15   
443-731 9 Port Deposit MD BLTMMDCHCMD  7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238      
443-732 A Silver Run MD BLTMMDFMDS0  7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238      
443-732 0 Silver Run MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2008-12-11   
443-732 1 Silver Run MD PIVLMDPKXEX  829J PAETEC ITEL, LLC 238   2004-02-05   
443-732 2 Silver Run MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2019-03-08   
443-732 3 Silver Run MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2012-10-08   
443-732 4 Silver Run MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2019-03-29   
443-732 5 Silver Run MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2011-06-23   
443-732 6 Silver Run MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2007-01-19   
443-732 7 Silver Run MD BLTQMD01DS0  568G PEERLESS NETWORK OF MARYLAND, LLC 238   2013-05-04   
443-732 8 Silver Run MD BLTQMD01DS0  568G PEERLESS NETWORK OF MARYLAND, LLC 238   2013-05-04   
443-732 9 Silver Run MD BLTMMDFMDS0  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 BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238   2003-02-16   
443-733 1 Waterloo MD PIVLMDPKXEX  829J PAETEC ITEL, LLC 238   2003-03-04   
443-733 2 Waterloo MD PIVLMDPKXFX  829J PAETEC ITEL, LLC 238   2009-03-17   
443-733 3 Waterloo MD BLTOMDKHDS0  7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 238   2008-10-01   
443-733 4 Waterloo MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2016-04-28   
443-733 5 Waterloo MD PIVLMDPKXEX  829J PAETEC ITEL, LLC 238   2013-10-10   
443-733 6 Waterloo MD BLTMMDCH42Z  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 CLMAMDNIDS1  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 BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2014-09-06   
443-734 2 Severn MD BLTMMDCH40Z  5562 METROPCS, INC. 238   2015-03-06   
443-734 3 Severn MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2016-01-22   
443-734 4 Severn MD CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2018-04-02   
443-734 5 Severn MD BLTMMDCH40Z  5562 METROPCS, INC. 238   2015-03-13   
443-734 6 Severn MD CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2018-11-11   
443-734 7 Severn MD CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2017-05-29   
443-734 8 Severn MD CLMAMDORAMD  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2017-05-29   
443-734 9 Severn MD ODTNMDONDS0  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 SLBRMDSCXLX  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 242      
443-736 1 Salisbury MD SLBRMDSBXFX  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 242   2013-07-21   
443-736 2 Salisbury MD SLBRMDSBXFX  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 242   2011-04-16   
443-736 3 Salisbury MD SLBRMDSBXLX  318J COMCAST IP PHONE, LLC 242   2008-03-26   
443-736 4 Salisbury MD SLBRMDSBXLX  318J COMCAST IP PHONE, LLC 242   2008-03-26   
443-736 5 Salisbury MD SLBRMDSCXMD  5562 METROPCS, INC. 242   2011-10-11   
443-736 6 Salisbury MD ESTNMDESQMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 242   2010-05-03   
443-736 7 Salisbury MD SLBRMDSBXLX  318J COMCAST IP PHONE, LLC 242   2007-10-29   

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Last updated: Tue, 01 Sep 2026 00:40:05 UTC

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