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: 546

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
424-546 A Torrance CA   624H ONVOY SPECTRUM, LLC 730   2025-03-24   
424-546 0 Torrance CA   624H ONVOY SPECTRUM, LLC 730   2025-03-24   
424-546 1 Torrance CA   649C ONVOY, LLC - CA 730   2025-10-27   
424-546 2 Torrance CA   649C ONVOY, LLC - CA 730   2026-05-09   
424-546 3 Torrance CA   649C ONVOY, LLC - CA 730   2026-05-09   

Last updated: Sat, 02 May 2026 12:20:53 UTC

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