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: RDCYCA01DS0

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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
650-817 6 Redwood City CA 9740 PACIFIC BELL 722      
650-817 9 Redwood City CA 9740 PACIFIC BELL 722      
650-839 A Redwood City CA 9740 PACIFIC BELL 722      
650-839 0 Redwood City CA 9740 PACIFIC BELL 722      
650-839 1 Redwood City CA 9740 PACIFIC BELL 722      
650-839 5 Redwood City CA 9740 PACIFIC BELL 722      
650-839 8 Redwood City CA 9740 PACIFIC BELL 722      
650-995 A Redwood City CA 9740 PACIFIC BELL 722      
650-995 8 Redwood City CA 9740 PACIFIC BELL 722      

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Last updated: Thu, 16 Oct 2025 03:04:18 UTC

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