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: ALBYCA11DS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
510-292 A Oakland: Berkeley DA CA 9740 PACIFIC BELL 722      
510-292 2 Oakland: Berkeley DA CA 9740 PACIFIC BELL 722      
510-524 A Oakland: Berkeley DA CA 9740 PACIFIC BELL 722      
510-525 A Oakland: Berkeley DA CA 9740 PACIFIC BELL 722      
510-526 A Oakland: Berkeley DA CA 9740 PACIFIC BELL 722      
510-527 A Oakland: Berkeley DA CA 9740 PACIFIC BELL 722      
510-528 A Oakland: Berkeley DA CA 9740 PACIFIC BELL 722      
510-558 A Oakland: Berkeley DA CA 9740 PACIFIC BELL 722      
510-558 0 Oakland: Berkeley DA CA 9740 PACIFIC BELL 722      
510-558 1 Oakland: Berkeley DA CA 9740 PACIFIC BELL 722      
510-558 2 Oakland: Berkeley DA CA 9740 PACIFIC BELL 722      
510-558 3 Oakland: Berkeley DA CA 9740 PACIFIC BELL 722      
510-558 4 Oakland: Berkeley DA CA 9740 PACIFIC BELL 722      
510-558 6 Oakland: Berkeley DA CA 9740 PACIFIC BELL 722      
510-558 7 Oakland: Berkeley DA CA 9740 PACIFIC BELL 722      
510-558 8 Oakland: Berkeley DA CA 9740 PACIFIC BELL 722      
510-558 9 Oakland: Berkeley DA CA 9740 PACIFIC BELL 722      
510-559 A Oakland: Berkeley DA CA 9740 PACIFIC BELL 722      
510-559 1 Oakland: Berkeley DA CA 9740 PACIFIC BELL 722      
510-559 2 Oakland: Berkeley DA CA 9740 PACIFIC BELL 722      
510-559 3 Oakland: Berkeley DA CA 9740 PACIFIC BELL 722      
510-559 4 Oakland: Berkeley DA CA 9740 PACIFIC BELL 722      
510-559 5 Oakland: Berkeley DA CA 9740 PACIFIC BELL 722      
510-559 6 Oakland: Berkeley DA CA 9740 PACIFIC BELL 722      
510-559 7 Oakland: Berkeley DA CA 9740 PACIFIC BELL 722      
510-559 8 Oakland: Berkeley DA CA 9740 PACIFIC BELL 722      
510-559 9 Oakland: Berkeley DA CA 9740 PACIFIC BELL 722      

Last updated: Tue, 16 Jun 2026 00:09:45 UTC

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