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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 >>

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
443-836 2 Baltimore MD BLTMMD91GT0  2593 CORE COMMUNICATIONS, INC. - MD 238   2019-04-12   
443-836 3 Baltimore MD BLTMMD91GT0  2593 CORE COMMUNICATIONS, INC. - MD 238   2019-04-12   
443-836 4 Baltimore MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2018-12-13   
443-836 5 Baltimore MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2020-02-13   
443-836 6 Baltimore MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2017-12-05   
443-836 7 Baltimore MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2017-12-05   
443-836 8 Baltimore MD   2593 CORE COMMUNICATIONS, INC. - MD 238   2018-10-19   
443-836 9 Baltimore MD   2593 CORE COMMUNICATIONS, INC. - MD 238   2018-10-19   
443-837 A Annapolis MD CLMAMDJTDS0  2589 US LEC OF MARYLAND, INC. 238      
443-837 0 Annapolis MD CLMAMDJTDS0  2589 US LEC OF MARYLAND, INC. 238      
443-837 1 Annapolis MD CLMAMDJTDS0  2589 US LEC OF MARYLAND, INC. 238      
443-837 2 Annapolis MD CLMAMDJTDS0  2589 US LEC OF MARYLAND, INC. 238      
443-837 3 Annapolis MD CLMAMDJTDS0  2589 US LEC OF MARYLAND, INC. 238      
443-837 4 Annapolis MD EKRGMD92MMD  6664 SPRINT SPECTRUM L.P. 238   2006-04-13   
443-837 5 Annapolis MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2008-12-11   
443-837 6 Annapolis MD BLTMMDCHXFX  318J COMCAST IP PHONE LLC 238   2008-02-17   
443-837 7 Annapolis MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2011-02-26   
443-837 8 Annapolis MD EKRGMD92MMD  6664 SPRINT SPECTRUM L.P. 238   2007-12-20   
443-837 9 Annapolis MD CLMAMDJTDS0  2589 US LEC OF MARYLAND, INC. 238      
443-838 A Baltimore MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
443-839 A Baltimore MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
443-839 0 Baltimore MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2011-01-27   
443-839 1 Baltimore MD EKRGMD92MMD  6664 SPRINT SPECTRUM L.P. 238   2006-08-28   
443-839 2 Baltimore MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2006-07-09   
443-839 3 Baltimore MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2006-07-09   
443-839 4 Baltimore MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2006-06-08   
443-839 5 Baltimore MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2006-06-08   
443-839 6 Baltimore MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2006-06-08   
443-839 7 Baltimore MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2006-06-08   
443-839 8 Baltimore MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2008-04-08   
443-839 9 Baltimore MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2006-06-08   
443-840 A Catonsville MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
443-840 0 Catonsville MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2005-06-18   
443-840 1 Catonsville MD CTVLMDCTDS0  9212 VERIZON MARYLAND, INC. 238   2008-07-10   
443-840 2 Catonsville MD CTVLMDCTDS0  9212 VERIZON MARYLAND, INC. 238   2008-07-10   
443-840 3 Catonsville MD CTVLMDCTDS0  9212 VERIZON MARYLAND, INC. 238   2008-07-10   
443-840 4 Catonsville MD CTVLMDCTDS0  9212 VERIZON MARYLAND, INC. 238   2008-07-10   
443-840 5 Catonsville MD CTVLMDCTDS0  9212 VERIZON MARYLAND, INC. 238   2008-07-10   
443-840 6 Catonsville MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2010-06-26   
443-840 7 Catonsville MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2011-07-31   
443-840 8 Catonsville MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2011-07-31   
443-840 9 Catonsville MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2008-12-11   
443-841 A Towson MD CYVLMDCKDS0  9212 VERIZON MARYLAND, INC. 238      
443-841 0 Towson MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2006-04-01   
443-841 1 Towson MD BLTMMDCH14Z  2697 CTC COMMUNICATIONS CORP. - MD 238   2005-03-10   
443-841 2 Towson MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2006-04-01   
443-841 3 Towson MD CYVLMDCKDS0  9212 VERIZON MARYLAND, INC. 238      
443-841 4 Towson MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2006-01-02   
443-841 5 Towson MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2006-01-02   
443-841 6 Towson MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2006-01-02   

<< 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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 >>

Last updated: Sun, 28 Feb 2021 19:06:05 UTC

Sponsored by: VoiceMeUp - Corporate VoIP Services

Like this site? We accept donations via PayPal.