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: AUSTTXGR78Z

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
737-438 A Austin TX 883K AHOI LLC 558   2026-05-17   
737-438 4 Austin TX 883K AHOI LLC 558   2026-05-17   

Last updated: Thu, 16 Jul 2026 02:21:55 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.