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.

NPA: 650 [Rate centres in NPA 650] [Dial plan for NPA 650]

NXX: 634

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
650-634 A South San Francisco CA SNBUCA02DS0  9740 PACIFIC BELL 722      
650-634 0 South San Francisco CA SNBUCA02DS0  9740 PACIFIC BELL 722      
650-634 1 South San Francisco CA SNBUCA02DS0  9740 PACIFIC BELL 722      
650-634 2 South San Francisco CA SNBUCA02DS0  9740 PACIFIC BELL 722      
650-634 3 South San Francisco CA SNBUCA02DS0  9740 PACIFIC BELL 722      
650-634 4 South San Francisco CA SNBUCA02DS0  9740 PACIFIC BELL 722      
650-634 5 South San Francisco CA SNBUCA02DS0  9740 PACIFIC BELL 722      
650-634 6 South San Francisco CA SNBUCA02DS0  9740 PACIFIC BELL 722      
650-634 7 South San Francisco CA SNBUCA02DS0  9740 PACIFIC BELL 722      
650-634 8 South San Francisco CA SNFCCA01XGX  516C AT&T CORP. 722   2014-04-16   
650-634 9 South San Francisco CA SNBUCA02DS0  9740 PACIFIC BELL 722      

Last updated: Fri, 22 Mar 2024 03:02:44 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.