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
443-661 5 Waterloo MD HNVAMDBHAMD  3910 CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 238      
443-661 7 Waterloo MD BLTMMDCHXVX  321J HD CARRIER LLC 238   2020-05-02   
443-661 8 Waterloo MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2021-04-29   
443-661 9 Waterloo MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2022-09-25   
443-662 A Sparks-Glencoe MD HNVAMDBHAMD  3910 CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 238      
443-662 0 Sparks-Glencoe MD HNVAMDBHAMD  3910 CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 238      
443-662 1 Sparks-Glencoe MD HNVAMDBHAMD  3910 CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 238      
443-662 2 Sparks-Glencoe MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2018-06-16   
443-662 3 Sparks-Glencoe MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2018-06-16   
443-662 4 Sparks-Glencoe MD CLMAMDNIDS1  7325 TELEPORT COMMUNICATIONS AMERICA, LLC - MD 238   2004-07-24   
443-662 5 Sparks-Glencoe MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2020-07-03   
443-662 6 Sparks-Glencoe MD BLTMMDCHX7X  073H TELNYX LLC 238   2017-04-26   
443-662 7 Sparks-Glencoe MD BLTQMD01DS0  568G PEERLESS NETWORK OF MARYLAND, LLC 238   2013-05-04   
443-662 8 Sparks-Glencoe MD BLTQMD01DS0  568G PEERLESS NETWORK OF MARYLAND, LLC 238   2013-05-04   
443-662 9 Sparks-Glencoe MD HNVAMDBHAMD  3910 CAVALIER TELEPHONE MID-ATLANTIC, LLC - MD 238      
443-663 A Woodlawn MD WDLWMDWLDS0  9212 VERIZON MARYLAND, INC. 238      
443-663 0 Woodlawn MD BLTMMDCH25Z  8697 BALTIMORE-WASHINGTON TELEPHONE (BWT) 238   2015-06-20   
443-663 1 Woodlawn MD BLTMMDSNDS5  4773 XO MARYLAND, LLC 238   2013-11-04   
443-663 2 Woodlawn MD   2593 CORE COMMUNICATIONS, INC.- MD 238   2019-05-02   
443-663 3 Woodlawn MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2016-03-14   
443-663 4 Woodlawn MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2015-10-05   
443-663 5 Woodlawn MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2016-03-14   
443-663 6 Woodlawn MD WDLWMDWLDS0  9212 VERIZON MARYLAND, INC. 238      
443-663 7 Woodlawn MD BLTMMDDN2MD  508J CENTURYLINK COMMUNICATIONS, LLC 238   2014-06-25   
443-663 8 Woodlawn MD WDLWMDWLDS0  9212 VERIZON MARYLAND, INC. 238      
443-663 9 Woodlawn MD   515J IP HORIZON LLC 238   2016-05-31   
443-664 A Ocean City MD SLBRMDSBX6Y  7944 CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD 242      
443-664 0 Ocean City MD SLBRMDSBX6Y  7944 CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD 242      
443-664 1 Ocean City MD SLBRMDSBX6Y  7944 CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD 242      
443-664 2 Ocean City MD SLBRMDSBXLX  318J COMCAST IP PHONE, LLC 242   2008-04-30   
443-664 3 Ocean City MD SLBRMDSBXVX  876D ONVOY, LLC - MD 242   2020-08-09   
443-664 4 Ocean City MD SLBRMDSBX6Y  7944 CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD 242      
443-664 5 Ocean City MD SLBRMDSBXLX  318J COMCAST IP PHONE, LLC 242   2012-05-25   
443-664 6 Ocean City MD SLBRMDSBXLX  318J COMCAST IP PHONE, LLC 242   2006-07-31   
443-664 7 Ocean City MD SLBRMDSBXLX  318J COMCAST IP PHONE, LLC 242   2014-11-17   
443-664 8 Ocean City MD SLBRMDSBXLX  318J COMCAST IP PHONE, LLC 242   2017-07-10   
443-664 9 Ocean City MD SLBRMDSBX6Y  7944 CAVALIER TELEPHONE, LLC (MID-ATLANTIC) - MD 242      
443-665 A Nanticoke MD SLBRMD90DS0  2593 CORE COMMUNICATIONS, INC.- MD 242      
443-665 0 Nanticoke MD SLBRMDSBXVX  876D ONVOY, LLC - MD 242   2020-04-30   
443-665 1 Nanticoke MD SLBRMDSBX0X  624H ONVOY SPECTRUM, LLC 242   2021-05-27   
443-665 2 Nanticoke MD SLBRMDSBXVX  876D ONVOY, LLC - MD 242   2023-05-18   
443-665 3 Nanticoke MD   2593 CORE COMMUNICATIONS, INC.- MD 242   2018-06-17   
443-665 4 Nanticoke MD SLBRMDSBXLX  318J COMCAST IP PHONE, LLC 242   2006-07-31   
443-665 5 Nanticoke MD   2593 CORE COMMUNICATIONS, INC.- MD 242   2018-06-17   
443-665 6 Nanticoke MD SLBRMD90DS0  2593 CORE COMMUNICATIONS, INC.- MD 242   2019-05-02   
443-665 7 Nanticoke MD   2593 CORE COMMUNICATIONS, INC.- MD 242   2018-06-17   
443-665 8 Nanticoke MD SLBRMDSBXVX  876D ONVOY, LLC - MD 242   2020-04-30   
443-665 9 Nanticoke MD SLBRMDSBXVX  876D ONVOY, LLC - MD 242   2020-04-30   
443-666 A Chestertown MD SLBRMDSBXFX  6119 LEVEL 3 COMMUNICATIONS, LLC - MD 242      
443-666 0 Chestertown MD ESTNMDESQMD  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 242   2018-01-25   

<< 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: Fri, 22 Mar 2024 03:02:44 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.