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.
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Switch: SNFCCA21XCZ

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
341-777 A Hayward CA 252F WIDE VOICE, LLC - CA 722      
341-888 A Fremont-Newark: Main DA CA 252F WIDE VOICE, LLC - CA 722      
369-777 A Sonoma CA 252F WIDE VOICE, LLC - CA 722      
369-888 A Ferndale CA 252F WIDE VOICE, LLC - CA 722      
369-999 A Kenwood CA 252F WIDE VOICE, LLC - CA 722      
408-344 A San Jose: West DA CA 6967 33 WIRELESS INC. 722      
408-880 A San Jose: South DA CA 6967 33 WIRELESS INC. 722      
415-416 A San Francisco: Central DA CA 252F WIDE VOICE, LLC - CA 722      
415-588 A San Francisco: Central DA CA 6967 33 WIRELESS INC. 722      
415-620 A San Francisco: Central DA CA 6967 33 WIRELESS INC. 722      
415-803 A San Francisco: Central DA CA 6967 33 WIRELESS INC. 722      
510-348 A Oakland: Main-Piedmont DA CA 6967 33 WIRELESS INC. 722      
510-554 A Hayward CA 6967 33 WIRELESS INC. 722      
510-699 A Oakland: Main-Piedmont DA CA 6967 33 WIRELESS INC. 722      
628-286 A San Francisco: Montrose-Evergreen DA CA 252F WIDE VOICE, LLC - CA 722      
650-277 A Redwood City CA 6967 33 WIRELESS INC. 722      
925-221 A Walnut Creek CA 6967 33 WIRELESS INC. 722      

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

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