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-NXX BLOCK Rate Centre Region Switch LATA LIR Eff date Disc date
210-750 A San Antonio TX SNANTXDIX8X  566      
214-214 A Dallas TX DLLSTX97GT7  552      
346-267 A Houston TX HSTNTXJAX5Y  560      
361-724 A Corpus Christi TX CRCHTXTUXAZ  564      
737-242 A Austin TX AUSTTXHOXCX  558      
956-553 A Harlingen TX HRLNTXHGXMX  568      

Last updated: Fri, 13 May 2022 22:16:13 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.