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: SNJUCACL4MD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
628-867 A San Francisco: Central DA CA 939H COMMIO LLC 722      
925-492 A Pittsburg CA 939H COMMIO LLC 722   2021-11-25   

Last updated: Fri, 01 Jul 2022 02:53:40 UTC

Sponsored by: VoiceMeUp - Corporate VoIP Services

Like this site? We accept donations via PayPal.