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: SNFCCAMKXIY

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
628-281 A San Francisco: Central DA CA 732J NUSO, LLC 722      
628-281 1 San Francisco: Central DA CA 732J NUSO, LLC 722   2023-03-16   
628-281 3 San Francisco: Central DA CA 732J NUSO, LLC 722   2023-12-09   
628-281 4 San Francisco: Central DA CA 732J NUSO, LLC 722   2023-12-09   
628-688 1 San Francisco: Central DA CA 732J NUSO, LLC 722   2024-08-13   

Last updated: Thu, 20 Nov 2025 13:34:34 UTC

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