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
443-485 0 Elkton MD   6626 OMNIPOINT COMMUNICATIONS ENTERPRISES, LP 238   2021-11-04   
443-485 1 Elkton MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2011-02-27   
443-485 2 Elkton MD   624H ONVOY SPECTRUM, LLC 238   2021-12-09   
443-485 3 Elkton MD   624H ONVOY SPECTRUM, LLC 238   2021-11-26   
443-485 4 Elkton MD   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238   2021-10-08   
443-485 5 Elkton MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2008-05-16   
443-485 6 Elkton MD   318J COMCAST IP PHONE, LLC 238   2007-10-29   
443-485 7 Elkton MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2011-02-10   
443-485 8 Elkton MD   6626 OMNIPOINT COMMUNICATIONS ENTERPRISES, LP 238   2011-02-26   
443-485 9 Elkton MD   145J TERRA NOVA TELECOM INC. 238   2021-07-16   
443-486 A Prince Frederick MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-486 0 Prince Frederick MD   145J TERRA NOVA TELECOM INC. 238   2021-07-16   
443-486 1 Prince Frederick MD   876D ONVOY, LLC - MD 238   2016-03-10   
443-486 2 Prince Frederick MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2006-03-14   
443-486 3 Prince Frederick MD   876D ONVOY, LLC - MD 238   2016-03-10   
443-486 4 Prince Frederick MD   9212 VERIZON MARYLAND, INC. 238   2004-07-15   
443-486 5 Prince Frederick MD   318J COMCAST IP PHONE, LLC 238   2013-09-06   
443-486 6 Prince Frederick MD   876D ONVOY, LLC - MD 238   2021-09-23   
443-486 7 Prince Frederick MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2008-02-13   
443-486 8 Prince Frederick MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2008-03-31   
443-486 9 Prince Frederick MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2021-12-15   
443-487 A Westminster MD BLTMMDSN6MD  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238      
443-487 0 Westminster MD   876D ONVOY, LLC - MD 238   2022-10-16   
443-487 1 Westminster MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2008-03-03   
443-487 2 Westminster MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2008-04-04   
443-487 3 Westminster MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2009-02-02   
443-487 4 Westminster MD   6119 LEVEL 3 COMMUNICATIONS, LLC - MD 238   2006-05-05   
443-487 5 Westminster MD   829J PAETEC ITEL, LLC 238   2002-11-16   
443-487 6 Westminster MD   071F BANDWIDTH.COM CLEC, LLC - MD 238   2010-09-03   
443-487 7 Westminster MD   6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 238   2007-09-21   
443-487 8 Westminster MD   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238   2002-11-25   
443-487 9 Westminster MD   318J COMCAST IP PHONE, LLC 238   2021-10-08   
443-488 A Baltimore MD CLMAMDORGT0  4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238      
443-488 0 Baltimore MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2010-08-14   
443-488 1 Baltimore MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2010-08-14   
443-488 2 Baltimore MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2010-08-14   
443-488 3 Baltimore MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2010-08-14   
443-488 4 Baltimore MD   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 238   2010-08-14   
443-488 5 Baltimore MD   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238   2010-10-20   
443-488 6 Baltimore MD   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238   2010-10-20   
443-488 7 Baltimore MD   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238   2010-10-20   
443-488 8 Baltimore MD   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238   2010-10-20   
443-488 9 Baltimore MD   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238   2010-10-20   
443-489 A Chase MD BLTMMDFMDS0  7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238      
443-489 0 Chase MD   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 238   2001-11-19   
443-489 1 Chase MD   568G PEERLESS NETWORK OF MARYLAND, LLC 238   2013-05-04   
443-489 2 Chase MD   876D ONVOY, LLC - MD 238   2016-03-24   
443-489 3 Chase MD   829J PAETEC ITEL, LLC 238   2007-01-24   
443-489 4 Chase MD   876D ONVOY, LLC - MD 238   2016-03-24   
443-489 5 Chase MD   7228 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 238   2008-10-01   

<< 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.