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: 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 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: Sat, 05 Apr 2025 03:03:23 UTC

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