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: 424 [Rate centres in NPA 424] [Dial plan for NPA 424]

NXX: 584

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
424-584 A Culver City CA   649C ONVOY, LLC - CA 730   2026-10-25   
424-584 0 Culver City CA   649C ONVOY, LLC - CA 730   2026-10-25   
424-584 1 Culver City CA   649C ONVOY, LLC - CA 730   2026-10-25   
424-584 7 Culver City CA   114J EXIANT COMMUNICATIONS LLC 730   2026-10-29   

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

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.