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: SNFCCA01DS5

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
415-486 A San Francisco: Central DA CA 7421 AT&T - LOCAL 722      
415-692 A San Francisco: Central DA CA 7421 AT&T - LOCAL 722      
650-260 A Redwood City CA 7421 AT&T - LOCAL 722      
650-264 A San Carlos-Belmont CA 7421 AT&T - LOCAL 722      
650-265 A Mountain View CA 7421 AT&T - LOCAL 722      
650-452 A South San Francisco CA 7421 AT&T - LOCAL 722      
650-690 A Palo Alto CA 7421 AT&T - LOCAL 722      
650-918 A San Mateo CA 7421 AT&T - LOCAL 722      

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

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