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: 903 [Rate centres in NPA 903] [Dial plan for NPA 903]

NXX: 231

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
903-231 A Tawakoni TX DLLATX37DS6  6114 LEVEL 3 COMMUNICATIONS, LLC - TX 552      
903-231 0 Tawakoni TX DLLSTXALDS4  903C ONVOY, LLC - TX 552   2012-12-13   
903-231 1 Tawakoni TX DLLATX37DS6  6114 LEVEL 3 COMMUNICATIONS, LLC - TX 552   2005-12-24   
903-231 2 Tawakoni TX DLLSTX37XWZ  004F BANDWIDTH.COM CLEC, LLC - TX 552   2011-06-17   
903-231 3 Tawakoni TX DLLSTX37XWZ  004F BANDWIDTH.COM CLEC, LLC - TX 552   2009-02-21   
903-231 4 Tawakoni TX DLLATX37DS6  6114 LEVEL 3 COMMUNICATIONS, LLC - TX 552   2004-07-19   
903-231 5 Tawakoni TX DLLSTX37XWZ  004F BANDWIDTH.COM CLEC, LLC - TX 552   2011-08-26   
903-231 6 Tawakoni TX DLLSTXALDS4  903C ONVOY, LLC - TX 552   2012-12-13   
903-231 7 Tawakoni TX DLLSTXALDS4  903C ONVOY, LLC - TX 552   2008-11-21   
903-231 8 Tawakoni TX DLLSTXALDS4  903C ONVOY, LLC - TX 552   2013-12-09   
903-231 9 Tawakoni TX DLLSTX37XWZ  004F BANDWIDTH.COM CLEC, LLC - TX 552   2008-10-10   

Last updated: Thu, 04 Aug 2022 23:14:42 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.