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.

Switch: PTLVTXXAIMD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
361-303 A Premont TX 903C ONVOY, LLC - TX 564      
361-303 9 Premont TX 903C ONVOY, LLC - TX 564   2022-12-15   

Last updated: Sat, 26 Aug 2023 16:14:14 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.