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: 530 [Rate centres in NPA 530] [Dial plan for NPA 530]

NXX: 256

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
530-256 A Westwood CA WSWDCAXFDS0  3402 CITIZENS TELECOMM DBA FRONTIER COMM GOLDEN STATE 724      
530-256 0 Westwood CA   3402 CITIZENS TELECOMM DBA FRONTIER COMM GOLDEN STATE 724      
530-256 1 Westwood CA   3402 CITIZENS TELECOMM DBA FRONTIER COMM GOLDEN STATE 724   2010-04-12   
530-256 2 Westwood CA   3402 CITIZENS TELECOMM DBA FRONTIER COMM GOLDEN STATE 724      
530-256 3 Westwood CA   3402 CITIZENS TELECOMM DBA FRONTIER COMM GOLDEN STATE 724      
530-256 7 Westwood CA   8826 LEVEL 3 COMMUNICATIONS, LLC - CA 724   2017-08-24   

Last updated: Thu, 01 Jan 2026 03:59:49 UTC

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.