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: LHCYAZXCDS0

Remotes:

Switch Switch name Switch type
CSRKAZXCRS1  CASTLE ROCK  RSC 
NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
928-302 5 Lake Havasu City AZ 2172 CITIZENS UTILITIES RURAL DBA FRONTIER UT RURAL 666   2007-05-12   
928-453 A Lake Havasu City AZ 2172 CITIZENS UTILITIES RURAL DBA FRONTIER UT RURAL 666      
928-505 A Lake Havasu City AZ 2172 CITIZENS UTILITIES RURAL DBA FRONTIER UT RURAL 666      
928-680 A Lake Havasu City AZ 2172 CITIZENS UTILITIES RURAL DBA FRONTIER UT RURAL 666      
928-854 A Lake Havasu City AZ 2172 CITIZENS UTILITIES RURAL DBA FRONTIER UT RURAL 666      
928-855 A Lake Havasu City AZ 2172 CITIZENS UTILITIES RURAL DBA FRONTIER UT RURAL 666      

Last updated: Tue, 15 Jul 2025 18:46:49 UTC

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