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: 442 [Rate centres in NPA 442] [Dial plan for NPA 442]

NXX: 450

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
442-450 A Twentynine Palms CA PLSPCAXGXPY  649C ONVOY, LLC - CA 973   2024-05-02   
442-450 0 Twentynine Palms CA PLSPCAXGXPY  649C ONVOY, LLC - CA 973   2024-05-02   
442-450 1 Twentynine Palms CA PLSPCAXGXPY  649C ONVOY, LLC - CA 973   2024-05-02   
442-450 2 Twentynine Palms CA   373F PEERLESS NETWORK OF CALIFORNIA, LLC - CA 973   2026-09-25   
442-450 4 Twentynine Palms CA PLSPCAXGXSZ  624H ONVOY SPECTRUM, LLC 973   2024-11-01   
442-450 5 Twentynine Palms CA PLSPCAXGXSZ  624H ONVOY SPECTRUM, LLC 973   2024-11-01   
442-450 6 Twentynine Palms CA PLSPCAXGXSZ  624H ONVOY SPECTRUM, LLC 973   2024-11-01   
442-450 7 Twentynine Palms CA PLSPCAXGXSZ  624H ONVOY SPECTRUM, LLC 973   2024-11-01   
442-450 8 Twentynine Palms CA PLSPCAXGXSZ  624H ONVOY SPECTRUM, LLC 973   2024-05-29   
442-450 9 Twentynine Palms CA PLSPCAXGXSZ  624H ONVOY SPECTRUM, LLC 973   2024-11-01   

Last updated: Sat, 10 Oct 2026 15:24:20 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.