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: 909 [Rate centres in NPA 909] [Dial plan for NPA 909]

NXX: 612

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
909-612 A Diamond Bar CA DMBRCAXF86M  2319 FRONTIER CALIFORNIA INC. 730      
909-612 0 Diamond Bar CA   2319 FRONTIER CALIFORNIA INC. 730      
909-612 1 Diamond Bar CA   2319 FRONTIER CALIFORNIA INC. 730      
909-612 2 Diamond Bar CA   2319 FRONTIER CALIFORNIA INC. 730      
909-612 3 Diamond Bar CA   7139 TELEPORT COMMUNICATIONS AMERICA, LLC - CA 730      
909-612 4 Diamond Bar CA   2319 FRONTIER CALIFORNIA INC. 730      
909-612 5 Diamond Bar CA   2319 FRONTIER CALIFORNIA INC. 730      
909-612 6 Diamond Bar CA   2319 FRONTIER CALIFORNIA INC. 730      
909-612 7 Diamond Bar CA   776C CHARTER FIBERLINK CA-CCO, LLC - CA 730   2005-10-27   
909-612 8 Diamond Bar CA   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 730   2001-10-08   
909-612 9 Diamond Bar CA   649C ONVOY, LLC - CA 730   2009-04-02   

Last updated: Thu, 01 Jan 2026 03:59:49 UTC

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.