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
415-223 6 San Rafael CA 7421 AT&T - LOCAL 722   2002-10-27   
415-324 3 Sausalito CA 7421 AT&T - LOCAL 722   2003-02-04   
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      
415-692 2 San Francisco: Central DA CA 7421 AT&T - LOCAL 722      
415-692 9 San Francisco: Central DA CA 7421 AT&T - LOCAL 722      
510-240 4 Fremont-Newark: Greenleaf DA CA 7421 AT&T - LOCAL 722   2002-09-03   
510-342 1 Hayward CA 7421 AT&T - LOCAL 722   2010-01-20   
510-344 4 Fremont-Newark: Oliver DA CA 7421 AT&T - LOCAL 722   2004-07-23   
510-576 4 Hayward CA 7421 AT&T - LOCAL 722   2001-07-25   
650-260 A Redwood City CA 7421 AT&T - LOCAL 722      
650-260 9 Redwood City CA 7421 AT&T - LOCAL 722      
650-264 A San Carlos-Belmont CA 7421 AT&T - LOCAL 722      
650-264 1 San Carlos-Belmont CA 7421 AT&T - LOCAL 722      
650-265 A Mountain View CA 7421 AT&T - LOCAL 722      
650-265 3 Mountain View CA 7421 AT&T - LOCAL 722      
650-265 5 Mountain View CA 7421 AT&T - LOCAL 722      
650-386 7 Mountain View CA 7421 AT&T - LOCAL 722   2012-06-08   
650-449 5 San Francisco: Juniper DA CA 7421 AT&T - LOCAL 722   2002-07-22   
650-452 A South San Francisco CA 7421 AT&T - LOCAL 722      
650-452 1 South San Francisco CA 7421 AT&T - LOCAL 722      
650-690 A Palo Alto CA 7421 AT&T - LOCAL 722      
650-690 9 Palo Alto CA 7421 AT&T - LOCAL 722      
650-918 A San Mateo CA 7421 AT&T - LOCAL 722      
650-918 3 San Mateo CA 7421 AT&T - LOCAL 722      

Last updated: Wed, 18 Jun 2025 02:30:00 UTC

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