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: 365

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
831-365 A Santa Cruz CA   649C ONVOY, LLC - CA 722   2026-09-14   
831-365 0 Santa Cruz CA   649C ONVOY, LLC - CA 722   2026-09-14   
831-365 1 Santa Cruz CA   649C ONVOY, LLC - CA 722   2026-09-15   
831-365 9 Santa Cruz CA   649C ONVOY, LLC - CA 722   2026-09-15   

Last updated: Tue, 29 Sep 2026 03:00:13 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.