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: SLNSCA01XCY

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
831-231 A Greenfield (Monterey) CA 624H ONVOY SPECTRUM, LLC 736      
831-330 A Carmel CA 624H ONVOY SPECTRUM, LLC 736   2024-02-09   
831-808 A Soledad CA 624H ONVOY SPECTRUM, LLC 736   2024-02-09   
831-931 A King City CA 624H ONVOY SPECTRUM, LLC 736   2024-02-09   

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

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