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.

OCN: 6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC DBA T-MOBILE USA

<< 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 >>

NPA-NXX BLOCK Rate Centre Region Switch LATA LIR Eff date Disc date
443-477 9 Cambridge MD   242   2014-02-11   
443-495 9 Parkville MD   238   2015-08-14   
443-501 6 Pikesville MD   238   2014-03-22   
443-505 9 Essex MD   238   2019-10-07   
443-515 1 Cambridge MD   242   2010-08-21   
443-515 7 Cambridge MD   242   2015-04-12   
443-515 8 Cambridge MD   242   2015-04-12   
443-515 9 Cambridge MD   242   2014-11-08   
443-517 8 Glen Burnie MD   238   2008-04-21   
443-527 A Baltimore MD BLTMMDCH40Z  238      
443-529 A Baltimore MD BLTMMDCH40Z  238   2008-09-29   
443-529 2 Baltimore MD   238   2008-09-29   
443-529 3 Baltimore MD   238   2008-09-29   
443-529 4 Baltimore MD   238   2008-09-29   
443-529 5 Baltimore MD   238   2008-09-29   
443-529 6 Baltimore MD   238   2008-09-29   
443-529 7 Baltimore MD   238   2008-09-29   
443-535 2 Columbia MD   238   2005-09-15   
443-535 3 Columbia MD   238   2006-01-21   
443-535 5 Columbia MD   238   2007-02-08   
443-535 7 Columbia MD   238   2009-07-09   
443-537 0 Columbia MD   238   2009-10-30   
443-538 A Columbia MD BLTMMDCH40Z  238      
443-546 5 Columbia MD   238   2010-07-11   
443-546 8 Columbia MD   238   2008-10-10   
443-554 A Chase MD BLTMMDCH40Z  238      
443-554 0 Chase MD   238      
443-554 1 Chase MD   238   2014-12-13   
443-554 2 Chase MD   238   2014-12-13   
443-554 3 Chase MD   238   2015-10-09   
443-554 4 Chase MD   238   2015-12-24   
443-554 5 Chase MD   238   2015-12-24   
443-554 6 Chase MD   238      
443-554 7 Chase MD   238   2016-07-14   
443-554 8 Chase MD   238   2008-11-17   
443-554 9 Chase MD   238      
443-557 8 Glen Burnie MD   238   2007-06-16   
443-558 6 Aberdeen MD   236   2010-12-02   
443-558 8 Aberdeen MD   236   2010-12-02   
443-559 1 Essex MD   238   2008-02-04   
443-559 2 Essex MD   238   2007-03-02   
443-559 7 Essex MD   238   2008-06-16   
443-563 0 Baltimore MD   238   2007-07-07   
443-563 4 Baltimore MD   238   2015-02-14   
443-563 6 Baltimore MD   238   2015-02-14   
443-563 7 Baltimore MD   238   2015-02-14   
443-563 8 Baltimore MD   238   2015-02-14   
443-565 2 Randallstown MD   238   2015-10-09   
443-570 A Baltimore MD BLTMMDCH40Z  238      
443-572 1 Glen Burnie MD   238   2007-01-15   

<< 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 >>

Last updated: Thu, 10 Sep 2020 02:15:24 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.