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: SLNSCA01X9Y

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
831-204 A Monterey CA 649C ONVOY, LLC - CA 736   2025-01-12   
831-272 A Salinas CA 649C ONVOY, LLC - CA 736   2024-01-27   
831-273 A Salinas CA 649C ONVOY, LLC - CA 736      
831-286 A Greenfield (Monterey) CA 649C ONVOY, LLC - CA 736   2024-05-12   
831-298 A Carmel Valley CA 649C ONVOY, LLC - CA 736      
831-388 A Greenfield (Monterey) CA 649C ONVOY, LLC - CA 736      
831-417 A Salinas CA 649C ONVOY, LLC - CA 736      
831-830 A King City CA 649C ONVOY, LLC - CA 736      

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

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