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: 951 [Rate centres in NPA 951] [Dial plan for NPA 951]

NXX: 812

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
951-812 A Mira Loma CA   6010 NEW CINGULAR WIRELESS PCS, LLC 730   2026-06-15   
951-812 7 Mira Loma CA   649C ONVOY, LLC - CA 730   2026-06-22   
951-812 8 Mira Loma CA   649C ONVOY, LLC - CA 730   2026-06-22   
951-812 9 Mira Loma CA   6010 NEW CINGULAR WIRELESS PCS, LLC 730   2026-06-15   

Last updated: Tue, 16 Jun 2026 00:09:45 UTC

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.