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: 350

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
712-350 A Hamburg IA CRRLIAAF0MD  6266 UNITED STATES CELLULAR - IA 644      
712-350 0 Hamburg IA   6266 UNITED STATES CELLULAR - IA 644      
712-350 1 Hamburg IA   6266 UNITED STATES CELLULAR - IA 644      
712-350 2 Hamburg IA   221F ONVOY, LLC - IA 644   2016-07-18   
712-350 3 Hamburg IA   073H TELNYX LLC 644   2018-07-02   
712-350 4 Hamburg IA   939H COMMIO, LLC 644   2022-10-28   
712-350 5 Hamburg IA   221F ONVOY, LLC - IA 644   2019-09-20   
712-350 6 Hamburg IA   508J CENTURYLINK COMMUNICATIONS, LLC 644   2017-06-03   
712-350 7 Hamburg IA   221F ONVOY, LLC - IA 644   2015-12-04   
712-350 8 Hamburg IA   221F ONVOY, LLC - IA 644   2016-04-14   
712-350 9 Hamburg IA   221F ONVOY, LLC - IA 644   2016-04-14   

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

Sponsored by: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.