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: HYWRCAZRPS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
510-260 A Richmond CA 7610 COMCAST PHONE OF CALIFORNIA, LLC - CA 722      
510-397 A Hayward CA 7610 COMCAST PHONE OF CALIFORNIA, LLC - CA 722   2008-10-11   
510-573 A Fremont-Newark: Oliver DA CA 7610 COMCAST PHONE OF CALIFORNIA, LLC - CA 722      
510-586 A Hayward CA 7610 COMCAST PHONE OF CALIFORNIA, LLC - CA 722      
510-778 A Richmond CA 7610 COMCAST PHONE OF CALIFORNIA, LLC - CA 722      
510-878 A Oakland: Trinidad DA CA 7610 COMCAST PHONE OF CALIFORNIA, LLC - CA 722      
510-894 A Fremont-Newark: Main DA CA 7610 COMCAST PHONE OF CALIFORNIA, LLC - CA 722      
510-972 A Fremont-Newark: Greenleaf DA CA 7610 COMCAST PHONE OF CALIFORNIA, LLC - CA 722      
707-731 A Vallejo CA 7610 COMCAST PHONE OF CALIFORNIA, LLC - CA 722   2005-09-25   

Last updated: Sun, 10 Nov 2019 13:49:34 UTC

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