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.

Dow City, IA

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
712-412 A   221F ONVOY, LLC IA 644   2018-12-22   
712-412 4   221F ONVOY, LLC IA 644   2018-12-22   
712-412 7   7575 CENTURYLINK COMMUNICATIONS LLC 644   2018-12-25   
712-674 A DWCYIAXORS6  1127 FRONTIER COMMUNICATIONS OF IOWA, INC. 644      

Last updated: Sat, 29 Jun 2019 02:32:58 UTC

Sponsored by: VoiceMeUp - Corporate VoIP Services

Like this site? We accept donations via PayPal.