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

NXX: 578

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
424-578 A Inglewood CA   649C ONVOY, LLC - CA 730   2026-10-10   
424-578 0 Inglewood CA   649C ONVOY, LLC - CA 730   2026-10-10   
424-578 1 Inglewood CA   649C ONVOY, LLC - CA 730   2026-10-10   

Last updated: Tue, 01 Sep 2026 00:40:05 UTC

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