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 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 >>

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
443-318 A Cockeysville MD BLARMDBL1MD  7944 CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD 238      
443-318 0 Cockeysville MD   7944 CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD 238      
443-318 3 Cockeysville MD   5562 METRO PCS, INC. 238   2015-07-03   
443-318 4 Cockeysville MD   107D COMCAST PHONE OF NORTHERN MARYLAND, INC. - MD 238   2005-03-10   
443-318 5 Cockeysville MD   5562 METRO PCS, INC. 238   2017-01-18   
443-318 7 Cockeysville MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2007-12-04   
443-318 8 Cockeysville MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2011-10-14   
443-318 9 Cockeysville MD   7944 CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD 238      
443-319 A Columbia MD BLARMDBL1MD  7944 CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD 238      
443-319 0 Columbia MD   7944 CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD 238      
443-319 2 Columbia MD   5562 METRO PCS, INC. 238   2016-01-08   
443-319 3 Columbia MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC DBA T-MOBILE USA 238   2008-06-16   
443-319 4 Columbia MD   5966 LIGHTWAVE COMMUNICATIONS, LLC - MD 238   2005-07-04   
443-319 5 Columbia MD   107D COMCAST PHONE OF NORTHERN MARYLAND, INC. - MD 238   2005-03-10   
443-319 6 Columbia MD   7944 CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD 238      
443-319 7 Columbia MD   5562 METRO PCS, INC. 238   2016-02-03   
443-319 8 Columbia MD   4773 XO MARYLAND, LLC 238   2010-11-19   
443-319 9 Columbia MD   7944 CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD 238      
443-320 A Baltimore MD BLTOMDXIDS0  6050 GLOBAL CROSSING LOCAL SERVICES, INC.-MD 238      
443-320 0 Baltimore MD   6050 GLOBAL CROSSING LOCAL SERVICES, INC.-MD 238      
443-320 1 Baltimore MD   6050 GLOBAL CROSSING LOCAL SERVICES, INC.-MD 238      
443-320 2 Baltimore MD   6050 GLOBAL CROSSING LOCAL SERVICES, INC.-MD 238      
443-320 3 Baltimore MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC DBA T-MOBILE USA 238   2004-12-03   
443-320 4 Baltimore MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-320 5 Baltimore MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-320 6 Baltimore MD   6664 SPRINT SPECTRUM L.P. 238   2004-09-23   
443-320 7 Baltimore MD   2589 US LEC OF MARYLAND, INC. 238   2012-03-13   
443-320 8 Baltimore MD   6664 SPRINT SPECTRUM L.P. 238   2004-09-23   
443-320 9 Baltimore MD   6050 GLOBAL CROSSING LOCAL SERVICES, INC.-MD 238      
443-321 A Annapolis MD BLTMMDCHW29  4716 PAETEC COMMUNICATIONS, INC. - MD 238      
443-322 A Towson MD HNVAMDBHRS0  3910 CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 238      
443-322 0 Towson MD   3910 CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 238      
443-322 1 Towson MD   3910 CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 238      
443-322 2 Towson MD   3910 CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 238      
443-322 3 Towson MD   876D ONVOY, LLC - MD 238   2020-06-04   
443-322 4 Towson MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2005-06-01   
443-322 5 Towson MD   3910 CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 238      
443-322 6 Towson MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2005-06-01   
443-322 7 Towson MD   3910 CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 238      
443-322 8 Towson MD   3910 CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 238      
443-322 9 Towson MD   3910 CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 238      
443-323 A Sharptown MD SLBRMDSBDC0  7944 CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD 242      
443-323 0 Sharptown MD   876D ONVOY, LLC - MD 242   2020-04-30   
443-323 3 Sharptown MD   318J COMCAST IP PHONE, LLC 242   2006-07-31   
443-323 4 Sharptown MD   2593 CORE COMMUNICATIONS, INC. - MD 242   2019-05-02   
443-323 5 Sharptown MD   2593 CORE COMMUNICATIONS, INC. - MD 242   2018-06-17   
443-323 6 Sharptown MD   2593 CORE COMMUNICATIONS, INC. - MD 242   2019-05-02   
443-323 7 Sharptown MD   2593 CORE COMMUNICATIONS, INC. - MD 242   2018-06-17   
443-323 8 Sharptown MD   2593 CORE COMMUNICATIONS, INC. - MD 242   2018-06-17   
443-323 9 Sharptown MD   7944 CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD 242      

<< 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 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 >>

Last updated: Sun, 31 May 2020 11:59:01 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.