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.

Charter Oak, IA

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
712-354 A OMAHNENWXPX  221F ONVOY, LLC - IA 644      
712-354 1   624H ONVOY SPECTRUM, LLC 644   2021-10-30   
712-354 2   221F ONVOY, LLC - IA 644   2020-10-02   
712-354 3   221F ONVOY, LLC - IA 644   2018-12-22   
712-354 4   221F ONVOY, LLC - IA 644   2020-10-02   
712-354 5   221F ONVOY, LLC - IA 644   2021-05-10   
712-354 6   624H ONVOY SPECTRUM, LLC 644   2021-07-18   
712-354 7   508J CENTURYLINK COMMUNICATIONS, LLC 644   2018-12-25   
712-678 A CHROIAXORS6  1127 FRONTIER COMMUNICATIONS OF IOWA, INC. 644      

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.