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: MDSTCA03DS0

Remotes:

Switch Switch name Switch type
HGSNCA11RS0  HUGHSON  5ER 
LGRNCA12RS0  LA GRANGE  5ER 
WTFRCA11RS0  WATERFORD  5ER 
NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
209-531 A Modesto CA 9740 PACIFIC BELL 738      
209-531 0 Modesto CA 9740 PACIFIC BELL 738      
209-531 1 Modesto CA 9740 PACIFIC BELL 738      
209-531 2 Modesto CA 9740 PACIFIC BELL 738      
209-531 9 Modesto CA 9740 PACIFIC BELL 738      
209-537 A Modesto CA 9740 PACIFIC BELL 738      
209-538 A Modesto CA 9740 PACIFIC BELL 738      
209-541 A Modesto CA 9740 PACIFIC BELL 738      
209-541 0 Modesto CA 9740 PACIFIC BELL 738      
209-541 1 Modesto CA 9740 PACIFIC BELL 738      
209-541 2 Modesto CA 9740 PACIFIC BELL 738      
209-541 3 Modesto CA 9740 PACIFIC BELL 738      
209-556 A Modesto CA 9740 PACIFIC BELL 738      
209-556 0 Modesto CA 9740 PACIFIC BELL 738      
209-556 1 Modesto CA 9740 PACIFIC BELL 738      
209-556 4 Modesto CA 9740 PACIFIC BELL 738      
209-556 5 Modesto CA 9740 PACIFIC BELL 738      
209-556 6 Modesto CA 9740 PACIFIC BELL 738      
209-556 9 Modesto CA 9740 PACIFIC BELL 738      
209-581 A Modesto CA 9740 PACIFIC BELL 738      
209-581 0 Modesto CA 9740 PACIFIC BELL 738      
209-581 9 Modesto CA 9740 PACIFIC BELL 738      

Last updated: Tue, 07 Oct 2025 16:47:53 UTC

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