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
443-580 7 Baltimore MD EKRGMD92MMD  6664 SPRINT SPECTRUM L.P. 238   2011-10-27   
443-580 8 Baltimore MD EKRGMD92MMD  6664 SPRINT SPECTRUM L.P. 238   2011-10-27   
443-580 9 Baltimore MD EKRGMD92MMD  6664 SPRINT SPECTRUM L.P. 238   2011-10-27   
443-581 A Chase MD BLTMMDSNDS5  4773 XO MARYLAND, LLC 238      
443-581 0 Chase MD   876D ONVOY, LLC - MD 238   2021-03-04   
443-581 1 Chase MD   876D ONVOY, LLC - MD 238   2021-03-04   
443-581 2 Chase MD   2593 CORE COMMUNICATIONS, INC. - MD 238   2018-06-16   
443-581 3 Chase MD   2593 CORE COMMUNICATIONS, INC. - MD 238   2018-06-16   
443-581 4 Chase MD   2593 CORE COMMUNICATIONS, INC. - MD 238   2018-06-16   
443-581 5 Chase MD   624H ONVOY SPECTRUM, LLC 238   2021-02-24   
443-581 6 Chase MD BLTMMD91GT0  2593 CORE COMMUNICATIONS, INC. - MD 238   2019-07-30   
443-581 7 Chase MD BLTMMD91GT0  2593 CORE COMMUNICATIONS, INC. - MD 238   2019-07-30   
443-581 8 Chase MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2019-07-06   
443-581 9 Chase MD BLTMMD91GT0  2593 CORE COMMUNICATIONS, INC. - MD 238   2019-04-30   
443-582 A Churchville MD BLTMMDCH14Z  2697 CTC COMMUNICATIONS CORP. - MD 238      
443-582 0 Churchville MD BLTMMDCHX7X  073H TELNYX LLC 238   2017-04-26   
443-582 1 Churchville MD BLTMMDCH14Z  2697 CTC COMMUNICATIONS CORP. - MD 238      
443-582 2 Churchville MD BLTMMD91GT0  2593 CORE COMMUNICATIONS, INC. - MD 238   2019-07-30   
443-582 3 Churchville MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2017-05-29   
443-582 4 Churchville MD   2593 CORE COMMUNICATIONS, INC. - MD 238   2018-06-16   
443-582 5 Churchville MD   2593 CORE COMMUNICATIONS, INC. - MD 238   2018-06-16   
443-582 6 Churchville MD BLTMMD91GT0  2593 CORE COMMUNICATIONS, INC. - MD 238   2019-07-30   
443-582 8 Churchville MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2018-07-28   
443-582 9 Churchville MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2018-05-31   
443-583 A Columbia MD BLTMMDCH14Z  2697 CTC COMMUNICATIONS CORP. - MD 238      
443-583 0 Columbia MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2016-03-03   
443-583 1 Columbia MD BLTMMDCH14Z  2697 CTC COMMUNICATIONS CORP. - MD 238      
443-583 2 Columbia MD BLTMMD91DS2  2596 QUANTUM TELECOMMUNICATIONS, INC. - MD 238   2016-01-31   
443-583 3 Columbia MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2014-03-31   
443-583 4 Columbia MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2014-03-31   
443-583 5 Columbia MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2014-09-01   
443-583 6 Columbia MD BLTMMDCHFMD  5562 METRO PCS, INC. 238   2015-05-29   
443-583 7 Columbia MD BLTMMDCHXFX  318J COMCAST IP PHONE LLC 238   2014-09-16   
443-583 8 Columbia MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2015-05-14   
443-583 9 Columbia MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2014-11-08   
443-584 A Crofton MD BLTMMDCH14Z  2697 CTC COMMUNICATIONS CORP. - MD 238      
443-584 1 Crofton MD BLTMMDCH14Z  2697 CTC COMMUNICATIONS CORP. - MD 238      
443-584 2 Crofton MD   2593 CORE COMMUNICATIONS, INC. - MD 238   2018-06-16   
443-584 3 Crofton MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2014-06-06   
443-584 4 Crofton MD BLTMMDCHXFX  318J COMCAST IP PHONE LLC 238   2014-07-20   
443-584 5 Crofton MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2015-05-21   
443-584 6 Crofton MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2015-05-21   
443-584 7 Crofton MD   508J CENTURYLINK COMMUNICATIONS LLC 238   2014-06-25   
443-584 8 Crofton MD BLTMMDCHLMD  082H LOCAL ACCESS LLC - MD 238   2016-10-14   
443-584 9 Crofton MD BLTQMD010MD  082H LOCAL ACCESS LLC - MD 238   2015-03-21   
443-585 A Darlington MD BLTMMDCH14Z  2697 CTC COMMUNICATIONS CORP. - MD 238      
443-585 0 Darlington MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2015-05-21   
443-585 1 Darlington MD BLTMMDCH14Z  2697 CTC COMMUNICATIONS CORP. - MD 238      
443-585 2 Darlington MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2015-05-21   
443-585 3 Darlington MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2016-04-10   

<< 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: VoIP Much Phone Company

Like this site? We accept donations via PayPal.