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: SNJUCACLHMD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
628-312 2 San Francisco: Central DA CA 616J LEAP TELECOM, LLC 722   2025-06-16   
628-312 3 San Francisco: Central DA CA 616J LEAP TELECOM, LLC 722   2025-06-16   
628-789 A San Francisco: Central DA CA 616J LEAP TELECOM, LLC 722      
628-789 1 San Francisco: Central DA CA 616J LEAP TELECOM, LLC 722   2022-11-16   

Last updated: Thu, 16 Jul 2026 02:21:55 UTC

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