Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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NPA: 443 [Rate centres in NPA 443] [Dial plan for NPA 443]

NXX: 646

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
443-646 A North Beach MD PIVLMDPKXFX  829J PAETEC ITEL, LLC 238   2025-04-01   
443-646 1 North Beach MD PIVLMDPKXFX  829J PAETEC ITEL, LLC 238      
443-646 2 North Beach MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2016-12-02   
443-646 3 North Beach MD BLTMMDCH45Z  071F BANDWIDTH.COM CLEC, LLC - MD 238   2015-06-04   
443-646 4 North Beach MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2016-03-23   
443-646 5 North Beach MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2014-05-01   
443-646 6 North Beach MD BLTMMDCHXFX  318J COMCAST IP PHONE, LLC 238   2015-08-05   
443-646 7 North Beach MD BLTMMDDN2MD  508J CENTURYLINK COMMUNICATIONS, LLC 238   2014-06-12   
443-646 8 North Beach MD BLTMMDCH42Z  876D ONVOY, LLC - MD 238   2016-03-23   
443-646 9 North Beach MD BLTMMDCHX7X  073H TELNYX LLC 238   2017-04-26   

Last updated: Sun, 01 Nov 2026 02:11:49 UTC

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