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: SNFCCA01XGX

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
408-320 A San Jose: West DA CA 516C AT&T CORP. 722      
415-347 A San Francisco: Juniper DA CA 516C AT&T CORP. 722      
415-769 A San Francisco: Juniper DA CA 516C AT&T CORP. 722      
415-909 A San Francisco: Juniper DA CA 516C AT&T CORP. 722      
510-686 A Oakland: Trinidad DA CA 516C AT&T CORP. 722      
510-876 A Hayward CA 516C AT&T CORP. 722      
650-673 A La Honda CA 516C AT&T CORP. 722      
669-235 A San Jose: North DA CA 516C AT&T CORP. 722      
669-246 A Sunnyvale CA 516C AT&T CORP. 722      
669-292 A San Jose: West DA CA 516C AT&T CORP. 722      
707-532 A Loleta CA 516C AT&T CORP. 722      
707-706 A Annapolis CA 516C AT&T CORP. 722      
831-226 A Santa Cruz CA 516C AT&T CORP. 722      
925-384 A Antioch CA 516C AT&T CORP. 722      

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

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