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: 740 [Rate centres in NPA 740] [Dial plan for NPA 740]

NXX: 400

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
740-400 A Baltimore OH CLMKOHPEPS2  547D TIME WARNER CABLE INFORMATION SVCS (OHIO) - OH 324      
740-400 0 Baltimore OH CLMBOH11XLZ  001F BANDWIDTH.COM CLEC, LLC - OH 324   2012-01-27   
740-400 1 Baltimore OH HLRDOHEJGT0  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 324   2014-10-20   
740-400 2 Baltimore OH HLRDOHEJGT0  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 324   2016-09-30   
740-400 3 Baltimore OH HLRDOHEJGT0  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 324   2016-03-29   
740-400 4 Baltimore OH CLMKOHPEPS2  547D TIME WARNER CABLE INFORMATION SVCS (OHIO) - OH 324   2007-02-14   
740-400 5 Baltimore OH CLMKOHPEPS2  547D TIME WARNER CABLE INFORMATION SVCS (OHIO) - OH 324   2012-12-14   
740-400 6 Baltimore OH CLMBOH1125Z  508J CENTURYLINK COMMUNICATIONS, LLC 324   2014-07-03   
740-400 7 Baltimore OH CLMBOHLT1MD  464C ONVOY, LLC - OH 324   2017-08-15   
740-400 8 Baltimore OH HLRDOHEJGT0  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 324   2015-10-23   
740-400 9 Baltimore OH HLRDOHEJGT0  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 324   2015-05-15   

Last updated: Sat, 01 Jun 2024 11:59:14 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.