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
443-723 1 Baltimore MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2011-11-20   
443-723 2 Baltimore MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2011-11-20   
443-723 3 Baltimore MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2011-11-20   
443-723 4 Baltimore MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2011-11-20   
443-723 5 Baltimore MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2024-04-13   
443-723 6 Baltimore MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2011-11-20   
443-723 7 Baltimore MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2024-04-13   
443-723 8 Baltimore MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2024-04-13   
443-723 9 Baltimore MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2011-11-20   
443-724 A Easton MD   829J PAETEC ITEL, LLC 242   2025-04-01   
443-724 0 Easton MD   829J PAETEC ITEL, LLC 242      
443-724 1 Easton MD   829J PAETEC ITEL, LLC 242      
443-724 2 Easton MD   829J PAETEC ITEL, LLC 242      
443-724 3 Easton MD   829J PAETEC ITEL, LLC 242      
443-724 4 Easton MD   829J PAETEC ITEL, LLC 242      
443-724 5 Easton MD   829J PAETEC ITEL, LLC 242      
443-724 6 Easton MD   829J PAETEC ITEL, LLC 242      
443-724 7 Easton MD   568G PEERLESS NETWORK OF MARYLAND, LLC 242   2020-10-28   
443-724 8 Easton MD   939H COMMIO, LLC 242   2022-08-21   
443-724 9 Easton MD   829J PAETEC ITEL, LLC 242      
443-725 A Parkville MD   829J PAETEC ITEL, LLC 238   2025-04-01   
443-725 0 Parkville MD   829J PAETEC ITEL, LLC 238      
443-725 1 Parkville MD   829J PAETEC ITEL, LLC 238      
443-725 2 Parkville MD   829J PAETEC ITEL, LLC 238      
443-725 3 Parkville MD   829J PAETEC ITEL, LLC 238      
443-725 4 Parkville MD   318J COMCAST IP PHONE, LLC 238   2006-12-29   
443-725 5 Parkville MD   318J COMCAST IP PHONE, LLC 238   2006-12-29   
443-725 6 Parkville MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2019-02-08   
443-725 7 Parkville MD   318J COMCAST IP PHONE, LLC 238   2016-12-15   
443-725 8 Parkville MD   829J PAETEC ITEL, LLC 238      
443-725 9 Parkville MD   829J PAETEC ITEL, LLC 238      
443-726 A Baltimore MD BLTMMDCH40Z  6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2024-02-09   
443-726 0 Baltimore MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2011-11-20   
443-726 1 Baltimore MD   876D ONVOY, LLC - MD 238   2024-04-12   
443-726 2 Baltimore MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2011-11-20   
443-726 3 Baltimore MD   490J DISH WIRELESS, LLC 238   2024-05-13   
443-726 4 Baltimore MD   876D ONVOY, LLC - MD 238   2024-05-11   
443-726 5 Baltimore MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2011-11-20   
443-726 6 Baltimore MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2011-11-20   
443-726 7 Baltimore MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2011-11-20   
443-726 8 Baltimore MD   6855 OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 238   2011-11-20   
443-726 9 Baltimore MD   876D ONVOY, LLC - MD 238   2024-05-11   
443-727 A Bishopville MD   829J PAETEC ITEL, LLC 242   2025-04-01   
443-727 0 Bishopville MD   145J TERRA NOVA TELECOM INC. 242   2024-02-15   
443-727 1 Bishopville MD   876D ONVOY, LLC - MD 242   2021-03-05   
443-727 2 Bishopville MD   829J PAETEC ITEL, LLC 242      
443-727 3 Bishopville MD   861F MCC TELEPHONY OF THE MID-ATLANTIC, LLC - MD 242   2010-08-21   
443-727 4 Bishopville MD   073H TELNYX LLC 242   2017-09-13   
443-727 5 Bishopville MD   2593 CORE COMMUNICATIONS, INC.- MD 242   2018-06-17   
443-727 6 Bishopville MD   2593 CORE COMMUNICATIONS, INC.- MD 242   2018-06-17   

<< 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: ISP Telecom

Like this site? We accept donations via PayPal.