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: RDGCCAXGDS0

Remotes:

Switch Switch name Switch type
CHLKCAXFRS3  CHINA LAKE  5ER 
INYKCAXFRS2  INYOKERN  5ER 
KRVLCAXFRS1  KERNVILLE  5ER 
LKISCAXFRS1  LAKE ISABELLA  5ER 
RNBGCAXFRS4  RANDSBURG  5ER 
TRONCAXFRS1  TRONA  5ER 
WLDNCAXFRS1  WELDON  5ER 
NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
760-371 A Ridgecrest CA 4420 FRONTIER CALIFORNIA INC. 730      
760-375 A Ridgecrest CA 4420 FRONTIER CALIFORNIA INC. 730      
760-384 A Ridgecrest CA 4420 FRONTIER CALIFORNIA INC. 730      

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

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