Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
  • Effective date searches are available only for US area codes. Our sources for non-US NPA-NXX data do not provide this information.
  • If you want to search an entire area code regardless of activity, leave both the next and past days fields set to zero.

NPA: 443 [Rate centres in NPA 443] [Dial plan for NPA 443]

<< 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 >>

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
443-593 6 Elkton MD   515J IP HORIZON LLC 238   2015-03-23   
443-593 7 Elkton MD BLTMMDDN2MD  508J CENTURYLINK COMMUNICATIONS, LLC 238   2014-06-12   
443-593 8 Elkton MD BLTMMDCH40Z  6626 OMNIPOINT COMMUNICATIONS ENTERPRISES, LP 238   2014-02-09   
443-593 9 Elkton MD BLTMMDCH40Z  6626 OMNIPOINT COMMUNICATIONS ENTERPRISES, LP 238   2014-02-09   
443-594 A Sparrows Point MD BLTOMDXIDS0  6050 GLOBAL CROSSING LOCAL SERVICES, INC. - MD 238      
443-594 2 Sparrows Point MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2011-02-10   
443-594 3 Sparrows Point MD BLTOMDKHDS0  7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 238   2008-10-01   
443-594 4 Sparrows Point MD BLTOMDXIDS0  6050 GLOBAL CROSSING LOCAL SERVICES, INC. - MD 238      
443-594 5 Sparrows Point MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-594 6 Sparrows Point MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2012-10-08   
443-594 7 Sparrows Point MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2016-03-24   
443-594 8 Sparrows Point MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2016-03-24   
443-594 9 Sparrows Point MD   515J IP HORIZON LLC 238   2016-10-14   
443-595 A Sparks-Glencoe MD BLTOMDXIDS0  6050 GLOBAL CROSSING LOCAL SERVICES, INC. - MD 238      
443-595 1 Sparks-Glencoe MD BLTOMDXIDS0  6050 GLOBAL CROSSING LOCAL SERVICES, INC. - MD 238      
443-595 3 Sparks-Glencoe MD BLTMMDCH14Z  2697 CTC COMMUNICATIONS CORP. - MD 238   2006-07-01   
443-595 4 Sparks-Glencoe MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2020-09-28   
443-595 5 Sparks-Glencoe MD BLTQMD01DS0  568G PEERLESS NETWORK OF MARYLAND, LLC 238   2024-12-19   
443-595 6 Sparks-Glencoe MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2011-02-18   
443-595 7 Sparks-Glencoe MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2011-05-20   
443-595 8 Sparks-Glencoe MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2012-05-26   
443-595 9 Sparks-Glencoe MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2012-10-08   
443-596 A Essex MD BLTMMD91GT0  2593 CORE COMMUNICATIONS, INC.- MD 238      
443-596 0 Essex MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2024-02-25   
443-596 1 Essex MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2020-04-06   
443-596 2 Essex MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2019-04-30   
443-596 3 Essex MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2017-08-16   
443-596 4 Essex MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2017-10-20   
443-596 5 Essex MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2017-10-20   
443-596 6 Essex MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2018-05-27   
443-596 7 Essex MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2018-06-11   
443-596 8 Essex MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2018-09-28   
443-596 9 Essex MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2024-02-25   
443-597 A Severna Park MD BLTOMDXIDS0  6050 GLOBAL CROSSING LOCAL SERVICES, INC. - MD 238      
443-597 2 Severna Park MD BLTMMDCH40Z  5562 METROPCS, INC. 238   2007-01-03   
443-597 3 Severna Park MD BLTMMDCH40Z  5562 METROPCS, INC. 238   2007-01-03   
443-597 4 Severna Park MD BLTOMDXIDS0  6050 GLOBAL CROSSING LOCAL SERVICES, INC. - MD 238      
443-597 5 Severna Park MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2024-06-20   
443-597 6 Severna Park MD BLTMMDCH40Z  5562 METROPCS, INC. 238   2007-01-03   
443-597 7 Severna Park MD BLTMMDCH40Z  5562 METROPCS, INC. 238   2007-01-03   
443-597 8 Severna Park MD BLTMMDCH40Z  5562 METROPCS, INC. 238   2006-08-14   
443-597 9 Severna Park MD BLTMMDCH40Z  5562 METROPCS, INC. 238   2005-06-05   
443-598 A Sherwood Forest MD BLTOMDXIDS0  6050 GLOBAL CROSSING LOCAL SERVICES, INC. - MD 238      
443-598 2 Sherwood Forest MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2012-09-06   
443-598 3 Sherwood Forest MD BLTOMDKHDS0  7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 238   2008-10-01   
443-598 4 Sherwood Forest MD BLTOMDXIDS0  6050 GLOBAL CROSSING LOCAL SERVICES, INC. - MD 238      
443-598 5 Sherwood Forest MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2020-10-17   
443-598 6 Sherwood Forest MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2013-09-08   
443-598 7 Sherwood Forest MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2017-03-30   
443-598 8 Sherwood Forest MD BLTQMD01DS0  568G PEERLESS NETWORK OF MARYLAND, LLC 238   2013-05-04   
443-598 9 Sherwood Forest MD BLTQMD01DS0  568G PEERLESS NETWORK OF MARYLAND, LLC 238   2013-05-04   
443-599 A Severn MD BLTOMDXIDS0  6050 GLOBAL CROSSING LOCAL SERVICES, INC. - MD 238      
443-599 1 Severn MD BLTQMD018MD  145J TERRA NOVA TELECOM INC. 238   2024-10-12   
443-599 2 Severn MD BLTMMDCH40Z  5562 METROPCS, INC. 238   2013-06-14   
443-599 3 Severn MD BLTMMDCH40Z  5562 METROPCS, INC. 238   2013-06-14   
443-599 4 Severn MD BLTOMDXIDS0  6050 GLOBAL CROSSING LOCAL SERVICES, INC. - MD 238      
443-599 5 Severn MD BLTMMDCH40Z  5562 METROPCS, INC. 238   2020-09-06   
443-599 6 Severn MD BLTMMDCH40Z  5562 METROPCS, INC. 238   2015-02-01   
443-599 7 Severn MD BLTMMDDN2MD  508J CENTURYLINK COMMUNICATIONS, LLC 238   2014-06-25   
443-599 8 Severn MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2011-06-02   
443-599 9 Severn MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2008-12-11   
443-600 A Essex MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
443-600 0 Essex MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
443-600 1 Essex MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
443-600 2 Essex MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2005-04-15   
443-600 3 Essex MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2005-08-13   
443-600 4 Essex MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2005-10-09   
443-600 5 Essex MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2006-01-21   
443-600 6 Essex MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
443-600 7 Essex MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2006-03-30   
443-600 8 Essex MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2006-05-06   
443-600 9 Essex MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
443-601 A Fallston MD BLTMMDCH14Z  2697 CTC COMMUNICATIONS CORP. - MD 238      
443-601 0 Fallston MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2019-03-07   
443-601 1 Fallston MD BLTMMDCH14Z  2697 CTC COMMUNICATIONS CORP. - MD 238      
443-601 2 Fallston MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2019-03-07   
443-601 3 Fallston MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2016-03-23   
443-601 4 Fallston MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2016-03-23   
443-601 5 Fallston MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2017-08-07   
443-601 6 Fallston MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2019-03-07   
443-601 7 Fallston MD BLTMMDDN2MD  508J CENTURYLINK COMMUNICATIONS, LLC 238   2014-06-12   
443-601 8 Fallston MD BLTMMDCHX7X  073H TELNYX LLC 238   2017-04-25   
443-601 9 Fallston MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2015-04-26   
443-602 A Baltimore MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
443-602 0 Baltimore MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2007-04-08   
443-602 1 Baltimore MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2007-07-02   
443-602 2 Baltimore MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2007-07-02   
443-602 3 Baltimore MD BLTMMDCH14Z  2697 CTC COMMUNICATIONS CORP. - MD 238   2007-05-01   
443-602 4 Baltimore MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2007-07-02   
443-602 5 Baltimore MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2007-08-02   
443-602 6 Baltimore MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2007-08-02   
443-602 7 Baltimore MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2008-06-09   
443-602 8 Baltimore MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2007-09-11   
443-602 9 Baltimore MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2007-12-04   
443-603 A Annapolis MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-603 0 Annapolis MD   829J PAETEC ITEL, LLC 238      
443-603 1 Annapolis MD   829J PAETEC ITEL, LLC 238      
443-603 2 Annapolis MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2005-05-01   
443-603 3 Annapolis MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2005-05-01   
443-603 4 Annapolis MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2006-05-12   

<< 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 >>

Last updated: Sun, 26 Jan 2025 15:59:20 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.