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: COLSCAXFDS0

Remotes:

Switch Switch name Switch type
GRMSCAXFRS0  GRIMES  1RE 
MXWLCAXFRS0  MAXWELL  1RE 
PRTNCAXFRS0  PRINCETON  1RE 
NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
530-458 A Colusa CA 3402 CITIZENS TELECOMM DBA FRONTIER COMM GOLDEN STATE 726      

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

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