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.

Martinsburg, IA

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
641-402 A KNVLIAXCPMD  624H ONVOY SPECTRUM, LLC 632   2024-07-29   
641-402 0   624H ONVOY SPECTRUM, LLC 632   2024-07-29   
641-661 A MRBGIAXORP0  1178 WINDSTREAM IOWA COMMUNICATIONS, INC. 632      
641-661 0   1178 WINDSTREAM IOWA COMMUNICATIONS, INC. 632      
641-661 1   1178 WINDSTREAM IOWA COMMUNICATIONS, INC. 632      
641-661 2   1178 WINDSTREAM IOWA COMMUNICATIONS, INC. 632      
641-661 3   221F ONVOY, LLC - IA 632   2020-11-23   
641-661 4   1178 WINDSTREAM IOWA COMMUNICATIONS, INC. 632      
641-661 5   221F ONVOY, LLC - IA 632   2021-04-22   
641-661 6   544H INTEGRATED PATH COMMUNCATIONS, LLC - IA 632   2018-05-15   
641-661 7   508J CENTURYLINK COMMUNICATIONS, LLC 632   2017-03-24   
641-661 8   221F ONVOY, LLC - IA 632   2019-11-29   
641-661 9   221F ONVOY, LLC - IA 632   2021-04-22   

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.