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: OKLDCA12DS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
510-382 A Oakland: Trinidad DA CA 9740 PACIFIC BELL 722      
510-383 A Oakland: Trinidad DA CA 9740 PACIFIC BELL 722      
510-553 A Oakland: Trinidad DA CA 9740 PACIFIC BELL 722      
510-563 A Oakland: Trinidad DA CA 9740 PACIFIC BELL 722      
510-577 A Oakland: Trinidad DA CA 9740 PACIFIC BELL 722      
510-613 A Oakland: Trinidad DA CA 9740 PACIFIC BELL 722      
510-615 A Oakland: Trinidad DA CA 9740 PACIFIC BELL 722      
510-777 A Oakland: Trinidad DA CA 9740 PACIFIC BELL 722      

Last updated: Thu, 01 Jan 2026 03:59:49 UTC

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