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: 712 [Rate centres in NPA 712] [Dial plan for NPA 712]

NXX: 491

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
712-491 A Alta IA   7421 AT&T - LOCAL 630   2025-11-07   
712-491 9 Alta IA   7421 AT&T - LOCAL 630   2025-11-07   

Last updated: Mon, 15 Sep 2025 02:24:40 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.