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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 >>

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
443-582 A Churchville MD PIVLMDPKXFX  829J PAETEC ITEL, LLC 238   2025-04-01   
443-582 0 Churchville MD BLTMMDCHX7X  073H TELNYX LLC 238   2017-04-26   
443-582 1 Churchville MD PIVLMDPKXFX  829J PAETEC ITEL, LLC 238      
443-582 2 Churchville MD   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   2593 CORE COMMUNICATIONS, INC.- MD 238   2019-07-30   
443-582 7 Churchville MD BLTMMDCHXUX  624H ONVOY SPECTRUM, LLC 238   2021-05-28   
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 PIVLMDPKXFX  829J PAETEC ITEL, LLC 238   2025-04-01   
443-583 0 Columbia MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2016-03-03   
443-583 1 Columbia MD PIVLMDPKXFX  829J PAETEC ITEL, LLC 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 BLTMMDCH40Z  5562 METROPCS, 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 PIVLMDPKXFX  829J PAETEC ITEL, LLC 238   2025-04-01   
443-584 0 Crofton MD BLTMMDCHXUX  624H ONVOY SPECTRUM, LLC 238   2021-05-22   
443-584 1 Crofton MD PIVLMDPKXFX  829J PAETEC ITEL, LLC 238      
443-584 2 Crofton MD   145J TERRA NOVA TELECOM INC. 238   2024-02-15   
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 BLTMMDDN2MD  508J CENTURYLINK COMMUNICATIONS, LLC 238   2014-06-25   
443-584 8 Crofton MD   515J IP HORIZON LLC 238   2016-10-14   
443-584 9 Crofton MD   515J IP HORIZON LLC 238   2015-03-21   
443-585 A Darlington MD PIVLMDPKXFX  829J PAETEC ITEL, LLC 238   2025-04-01   
443-585 0 Darlington MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2015-05-21   
443-585 1 Darlington MD PIVLMDPKXFX  829J PAETEC ITEL, LLC 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   
443-585 4 Darlington MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2016-04-10   
443-585 5 Darlington MD BLTMMDCH25Z  8697 BALTIMORE-WASHINGTON TELEPHONE (BWT) 238   2015-06-11   
443-585 6 Darlington MD BLTMMDCHX7X  073H TELNYX LLC 238   2017-04-26   
443-585 7 Darlington MD BLTMMDDN2MD  508J CENTURYLINK COMMUNICATIONS, LLC 238   2014-06-12   
443-585 8 Darlington MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2014-09-19   
443-585 9 Darlington MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2014-09-19   
443-586 A Dundalk MD BLTMMD91GT0  2593 CORE COMMUNICATIONS, INC.- MD 238      
443-586 0 Dundalk MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2024-02-29   
443-586 1 Dundalk MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2024-02-29   
443-586 2 Dundalk MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2018-10-22   
443-586 3 Dundalk MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2018-10-22   
443-586 4 Dundalk MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2018-10-22   

<< 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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 >>

Last updated: Sat, 10 Oct 2026 15:24:20 UTC

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.