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: 255

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
840-255 A San Bernardino CA   649C ONVOY, LLC - CA 730   2024-05-09   
840-255 0 San Bernardino CA   649C ONVOY, LLC - CA 730   2024-05-09   
840-255 1 San Bernardino CA   649C ONVOY, LLC - CA 730   2024-05-09   
840-255 2 San Bernardino CA   649C ONVOY, LLC - CA 730   2024-05-09   
840-255 3 San Bernardino CA   649C ONVOY, LLC - CA 730   2024-05-09   
840-255 4 San Bernardino CA   6006 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 730   2024-05-11   
840-255 5 San Bernardino CA   6006 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 730   2024-06-11   
840-255 6 San Bernardino CA   6006 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 730   2024-07-11   
840-255 7 San Bernardino CA   6006 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 730   2024-08-12   
840-255 8 San Bernardino CA   6006 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 730   2024-05-10   
840-255 9 San Bernardino CA   649C ONVOY, LLC - CA 730   2024-05-10   

Last updated: Tue, 16 Apr 2024 01:38:01 UTC

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.