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: 556

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
650-556 A Redwood City CA RDCYCA01DS0  9740 PACIFIC BELL 722      
650-556 0 Redwood City CA RDCYCA01DS0  9740 PACIFIC BELL 722      
650-556 1 Redwood City CA RDCYCA01DS0  9740 PACIFIC BELL 722      
650-556 2 Redwood City CA RDCYCA01DS0  9740 PACIFIC BELL 722      
650-556 3 Redwood City CA SNTDCAUJCM9  6010 NEW CINGULAR WIRELESS PCS, LLC 722   2010-07-10   
650-556 4 Redwood City CA SNTDCAUJCM9  6010 NEW CINGULAR WIRELESS PCS, LLC 722   2010-07-10   
650-556 5 Redwood City CA SNTDCAUJCM9  6010 NEW CINGULAR WIRELESS PCS, LLC 722   2011-04-05   
650-556 6 Redwood City CA SNTDCAUJCM9  6010 NEW CINGULAR WIRELESS PCS, LLC 722   2011-04-05   
650-556 7 Redwood City CA RDCYCA01DS0  9740 PACIFIC BELL 722      
650-556 8 Redwood City CA RDCYCA01DS0  9740 PACIFIC BELL 722      
650-556 9 Redwood City CA RDCYCA01DS0  9740 PACIFIC BELL 722      

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

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.