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: UNCYCA11DS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
510-324 A Fremont-Newark: Greenleaf DA CA 9740 PACIFIC BELL 722      
510-429 A Fremont-Newark: Greenleaf DA CA 9740 PACIFIC BELL 722      
510-441 A Fremont-Newark: Greenleaf DA CA 9740 PACIFIC BELL 722      
510-471 A Fremont-Newark: Greenleaf DA CA 9740 PACIFIC BELL 722      
510-475 A Fremont-Newark: Greenleaf DA CA 9740 PACIFIC BELL 722      
510-476 A Fremont-Newark: Greenleaf DA CA 9740 PACIFIC BELL 722      
510-477 A Fremont-Newark: Greenleaf DA CA 9740 PACIFIC BELL 722      
510-487 A Fremont-Newark: Greenleaf DA CA 9740 PACIFIC BELL 722      
510-489 A Fremont-Newark: Greenleaf DA CA 9740 PACIFIC BELL 722      
510-675 A Fremont-Newark: Greenleaf DA CA 9740 PACIFIC BELL 722      

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

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