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: 812

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
712-812 A Sioux City IA   321J HD CARRIER LLC 630   2025-08-29   
712-812 0 Sioux City IA   221F ONVOY, LLC - IA 630   2025-10-12   
712-812 6 Sioux City IA   904D PREMIER COMMUNICATIONS, INC. - IA 630   2025-09-19   
712-812 7 Sioux City IA   321J HD CARRIER LLC 630   2025-08-29   
712-812 8 Sioux City IA   321J HD CARRIER LLC 630   2025-08-29   
712-812 9 Sioux City IA   321J HD CARRIER LLC 630   2025-08-29   

Last updated: Thu, 16 Oct 2025 03:04:18 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.