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: WSWDCAXFDS0

Remotes:

Switch Switch name Switch type
LKARCAXFRS1  LAKE ALMANOR  RSC 
NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
530-256 A Westwood CA 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      

Last updated: Thu, 16 Oct 2025 03:04:18 UTC

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