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: 323

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
909-323 A Diamond Bar CA COVNCAXFX3Y  649C ONVOY, LLC - CA 730   2024-01-23   
909-323 0 Diamond Bar CA   649C ONVOY, LLC - CA 730   2016-08-08   
909-323 1 Diamond Bar CA   649C ONVOY, LLC - CA 730   2016-08-08   
909-323 2 Diamond Bar CA   981E BANDWIDTH.COM CLEC, LLC - CA 730   2016-08-27   
909-323 3 Diamond Bar CA   649C ONVOY, LLC - CA 730   2016-06-18   
909-323 4 Diamond Bar CA   649C ONVOY, LLC - CA 730   2016-06-18   
909-323 5 Diamond Bar CA   649C ONVOY, LLC - CA 730   2016-10-01   
909-323 6 Diamond Bar CA   649C ONVOY, LLC - CA 730   2016-10-01   
909-323 7 Diamond Bar CA   649C ONVOY, LLC - CA 730   2016-06-10   
909-323 8 Diamond Bar CA   649C ONVOY, LLC - CA 730   2016-06-10   
909-323 9 Diamond Bar CA   6529 T-MOBILE USA, INC. 730   2016-09-23   

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

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.