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.

Switch: RDMDWAXADS1

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
425-755 A Kirkland WA 4324 ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 674   2024-02-14   

Last updated: Mon, 15 Sep 2025 02:24:40 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.