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: 554

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
424-554 A West Los Angeles CA   6010 NEW CINGULAR WIRELESS PCS, LLC 730   2025-05-31   
424-554 0 West Los Angeles CA   649C ONVOY, LLC - CA 730   2026-02-23   
424-554 1 West Los Angeles CA   649C ONVOY, LLC - CA 730   2025-09-27   
424-554 2 West Los Angeles CA   649C ONVOY, LLC - CA 730   2025-09-27   
424-554 3 West Los Angeles CA   649C ONVOY, LLC - CA 730   2025-10-27   
424-554 4 West Los Angeles CA   145J TERRA NOVA TELECOM INC. 730   2025-06-02   
424-554 5 West Los Angeles CA   6010 NEW CINGULAR WIRELESS PCS, LLC 730   2025-05-31   
424-554 6 West Los Angeles CA   6010 NEW CINGULAR WIRELESS PCS, LLC 730   2025-05-31   
424-554 7 West Los Angeles CA   6010 NEW CINGULAR WIRELESS PCS, LLC 730   2025-05-31   
424-554 8 West Los Angeles CA   6010 NEW CINGULAR WIRELESS PCS, LLC 730   2025-05-31   
424-554 9 West Los Angeles CA   6010 NEW CINGULAR WIRELESS PCS, LLC 730   2025-05-31   

Last updated: Thu, 05 Feb 2026 23:41:55 UTC

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.