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: GBCYTX02RS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
903-713 A Mabank TX 3726 ONE RING NETWORKS II, INC. D/B/A ONE RING NETWORKS 552      

Last updated: Tue, 16 Jun 2026 00:09:45 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.