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.

NPA: 831 [Rate centres in NPA 831] [Dial plan for NPA 831]

NXX: 931

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
831-931 A King City CA SLNSCA01XCY  624H ONVOY SPECTRUM, LLC 736   2024-02-09   
831-931 0 King City CA SLNSCA01XCY  624H ONVOY SPECTRUM, LLC 736   2024-02-09   
831-931 1 King City CA SLNSCA01X9Y  649C ONVOY, LLC - CA 736   2024-03-02   
831-931 8 King City CA SLNSCA01X9Y  649C ONVOY, LLC - CA 736   2024-04-05   

Last updated: Sun, 26 Jan 2025 15:59:20 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.