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.

Preston, IA

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
563-308 A PSTNIAXO0MD  751F MCC TELEPHONY OF IOWA, LLC - IA 634      
563-308 1   751F MCC TELEPHONY OF IOWA, LLC - IA 634   2010-05-06   
563-308 2   9877 LEVEL 3 COMMUNICATIONS, LLC - IA 634   2018-07-31   
563-308 9   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 634   2021-02-26   
563-689 A PSTNIAXODS0  1276 PRESTON TEL. CO. 634      

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

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.