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 >>

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
443-717 5 Baltimore MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2005-12-22   
443-717 6 Baltimore MD   318J COMCAST IP PHONE, LLC 238   2023-12-14   
443-717 7 Baltimore MD   318J COMCAST IP PHONE, LLC 238   2023-12-14   
443-717 8 Baltimore MD   318J COMCAST IP PHONE, LLC 238   2023-12-14   
443-717 9 Baltimore MD   318J COMCAST IP PHONE, LLC 238   2023-12-14   
443-718 A Columbia MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-718 0 Columbia MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2010-02-19   
443-718 1 Columbia MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2009-07-12   
443-718 2 Columbia MD   829J PAETEC ITEL, LLC 238   2008-05-10   
443-718 3 Columbia MD   829J PAETEC ITEL, LLC 238   2008-05-10   
443-718 4 Columbia MD   829J PAETEC ITEL, LLC 238   2008-06-16   
443-718 5 Columbia MD   829J PAETEC ITEL, LLC 238   2008-06-16   
443-718 6 Columbia MD   829J PAETEC ITEL, LLC 238   2008-09-25   
443-718 7 Columbia MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2009-07-12   
443-718 8 Columbia MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2010-04-02   
443-718 9 Columbia MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2008-12-11   
443-719 A Jarrettsville MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-719 0 Jarrettsville MD   829J PAETEC ITEL, LLC 238      
443-719 1 Jarrettsville MD   876D ONVOY, LLC - MD 238   2021-03-04   
443-719 4 Jarrettsville MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2019-07-30   
443-719 5 Jarrettsville MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2019-05-01   
443-719 6 Jarrettsville MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2019-05-01   
443-719 7 Jarrettsville MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2019-05-01   
443-719 8 Jarrettsville MD   568G PEERLESS NETWORK OF MARYLAND, LLC 238   2013-05-04   
443-719 9 Jarrettsville MD   568G PEERLESS NETWORK OF MARYLAND, LLC 238   2013-05-04   
443-720 A Aberdeen MD BLTMMDCHXNX  7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236      
443-720 0 Aberdeen MD   071F BANDWIDTH.COM CLEC, LLC - MD 236   2014-06-22   
443-720 1 Aberdeen MD   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236   2013-01-11   
443-720 2 Aberdeen MD   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236   2013-01-11   
443-720 3 Aberdeen MD   876D ONVOY, LLC - MD 236   2016-02-25   
443-720 4 Aberdeen MD   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236   2013-06-15   
443-720 5 Aberdeen MD   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 236   2013-01-14   
443-720 6 Aberdeen MD   071F BANDWIDTH.COM CLEC, LLC - MD 236   2018-07-19   
443-720 7 Aberdeen MD   876D ONVOY, LLC - MD 236   2014-08-30   
443-720 8 Aberdeen MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2013-07-09   
443-720 9 Aberdeen MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 236   2013-07-09   
443-721 A Baltimore MD BLTOMDKHBMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238      
443-721 0 Baltimore MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2009-09-05   
443-721 1 Baltimore MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2010-10-01   
443-721 2 Baltimore MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2010-10-01   
443-721 3 Baltimore MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2010-06-14   
443-721 4 Baltimore MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2010-06-14   
443-721 5 Baltimore MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2010-06-14   
443-721 6 Baltimore MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2010-06-14   
443-721 7 Baltimore MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2010-06-14   
443-721 8 Baltimore MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2010-07-03   
443-721 9 Baltimore MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2010-07-03   
443-722 A Baltimore MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238      
443-723 A Baltimore MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2024-02-09   
443-723 0 Baltimore MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2011-11-20   

<< 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 >>

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.