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: 374

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
424-374 A Hawthorne CA CYCMCALLCM5  6010 NEW CINGULAR WIRELESS PCS, LLC 730      
424-374 0 Hawthorne CA LSANCARCD3S  649C ONVOY, LLC - CA 730   2014-12-22   
424-374 1 Hawthorne CA LSANCARCD3S  649C ONVOY, LLC - CA 730   2014-12-22   
424-374 2 Hawthorne CA LSANCARCD3S  649C ONVOY, LLC - CA 730   2014-12-22   
424-374 3 Hawthorne CA LSANCARCD3S  649C ONVOY, LLC - CA 730   2014-12-22   
424-374 4 Hawthorne CA   793K TWC IP ENABLED SERVICES, LLC 730   2015-08-31   
424-374 5 Hawthorne CA   649C ONVOY, LLC - CA 730   2026-01-04   
424-374 6 Hawthorne CA TRNECAGB7MD  6529 T-MOBILE USA, INC. 730   2015-03-13   
424-374 7 Hawthorne CA TRNECAGB7MD  6529 T-MOBILE USA, INC. 730   2015-02-06   
424-374 8 Hawthorne CA   793K TWC IP ENABLED SERVICES, LLC 730   2014-12-17   
424-374 9 Hawthorne CA CYCMCALLCM5  6010 NEW CINGULAR WIRELESS PCS, LLC 730   2014-11-22   

Last updated: Tue, 16 Jun 2026 00:09:45 UTC

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.