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: 840 [Rate centres in NPA 840] [Dial plan for NPA 840]

NXX: 254

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
840-254 A Rialto CA LSANCARCD3S  649C ONVOY, LLC - CA 730   2024-05-09   
840-254 0 Rialto CA LSANCARCD3S  649C ONVOY, LLC - CA 730   2024-05-09   
840-254 1 Rialto CA LSANCARCD3S  649C ONVOY, LLC - CA 730   2024-05-09   
840-254 2 Rialto CA LSANCARCD3S  649C ONVOY, LLC - CA 730   2024-05-09   
840-254 6 Rialto CA LSANCAJWDS9  373F PEERLESS NETWORK OF CALIFORNIA, LLC - CA 730   2025-01-18   
840-254 7 Rialto CA RVSDCALBCM4  6010 NEW CINGULAR WIRELESS PCS, LLC 730   2024-10-05   
840-254 8 Rialto CA RVSDCALBCM4  6010 NEW CINGULAR WIRELESS PCS, LLC 730   2024-10-05   
840-254 9 Rialto CA RVSDCALBCM4  6010 NEW CINGULAR WIRELESS PCS, LLC 730   2024-08-31   

Last updated: Sun, 26 Jan 2025 15:59:20 UTC

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.