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

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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
831-887 6 Monterey CA 649C ONVOY, LLC - CA 736   2023-10-29   
831-921 2 Tres Pinos CA 649C ONVOY, LLC - CA 736   2019-07-28   
831-921 3 Tres Pinos CA 649C ONVOY, LLC - CA 736   2019-07-28   
831-931 1 King City CA 649C ONVOY, LLC - CA 736   2024-03-02   
831-931 8 King City CA 649C ONVOY, LLC - CA 736   2024-04-05   

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Last updated: Sat, 10 Oct 2026 15:24:20 UTC

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