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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
443-424 6 Cardiff MD   876D ONVOY, LLC - MD 238   2012-10-07   
443-424 7 Cardiff MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2011-06-02   
443-424 8 Cardiff MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2010-02-25   
443-424 9 Cardiff MD   7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238      
443-425 A Parkville MD BLTMMDCHCMD  7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238      
443-425 0 Parkville MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2012-05-21   
443-425 1 Parkville MD   7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238      
443-425 2 Parkville MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2012-05-21   
443-425 3 Parkville MD   7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 238   2008-10-01   
443-425 4 Parkville MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2011-11-17   
443-425 5 Parkville MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2011-11-17   
443-425 6 Parkville MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2011-11-17   
443-425 7 Parkville MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2011-11-17   
443-425 8 Parkville MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2011-11-17   
443-425 9 Parkville MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2015-06-30   
443-426 A Randallstown MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-426 0 Randallstown MD   829J PAETEC ITEL, LLC 238      
443-426 1 Randallstown MD   829J PAETEC ITEL, LLC 238      
443-426 2 Randallstown MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2005-02-12   
443-426 3 Randallstown MD   624H ONVOY SPECTRUM, LLC 238   2021-05-23   
443-426 4 Randallstown MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2003-08-20   
443-426 5 Randallstown MD   829J PAETEC ITEL, LLC 238   2003-03-04   
443-426 6 Randallstown MD   829J PAETEC ITEL, LLC 238   2006-03-18   
443-426 7 Randallstown MD   829J PAETEC ITEL, LLC 238   2004-06-25   
443-426 8 Randallstown MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2006-05-05   
443-426 9 Randallstown MD   829J PAETEC ITEL, LLC 238      
443-427 A Princess Anne MD SLBRMD90DS0  2593 CORE COMMUNICATIONS, INC.- MD 242      
443-428 A Cockeysville MD BLTMMD91GT0  2593 CORE COMMUNICATIONS, INC.- MD 238      
443-429 A Woodlawn MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-429 0 Woodlawn MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2011-07-02   
443-429 1 Woodlawn MD   876D ONVOY, LLC - MD 238   2012-10-08   
443-429 2 Woodlawn MD   318J COMCAST IP PHONE, LLC 238   2014-04-17   
443-429 3 Woodlawn MD   829J PAETEC ITEL, LLC 238   2001-11-01   
443-429 4 Woodlawn MD   829J PAETEC ITEL, LLC 238   2001-11-01   
443-429 5 Woodlawn MD   829J PAETEC ITEL, LLC 238   2001-11-01   
443-429 6 Woodlawn MD   829J PAETEC ITEL, LLC 238   2001-11-01   
443-429 7 Woodlawn MD   829J PAETEC ITEL, LLC 238   2001-11-01   
443-429 8 Woodlawn MD   568G PEERLESS NETWORK OF MARYLAND, LLC 238   2013-05-04   
443-429 9 Woodlawn MD   568G PEERLESS NETWORK OF MARYLAND, LLC 238   2013-05-04   
443-430 A Columbia MD BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-430 0 Columbia MD   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-430 1 Columbia MD   515J IP HORIZON LLC 238   2016-10-14   
443-430 2 Columbia MD   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238   2005-08-14   
443-430 3 Columbia MD   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      
443-430 4 Columbia MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2016-09-26   
443-430 5 Columbia MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2016-09-26   
443-430 6 Columbia MD   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238   2005-08-14   
443-430 7 Columbia MD   7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 238   2008-05-30   
443-430 8 Columbia MD   7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 238   2006-03-11   
443-430 9 Columbia MD   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238      

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

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