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: 523

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
951-523 A Corona CA ONTRCAFXDS0  7718 LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 730      
951-523 0 Corona CA LSANCA039MD  981E BANDWIDTH.COM CLEC, LLC - CA 730   2015-02-15   
951-523 1 Corona CA LSANCAJW7MD  939H COMMIO, LLC 730   2021-10-15   
951-523 2 Corona CA ONTRCAFXDS0  7718 LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 730   2014-12-11   
951-523 3 Corona CA ONTRCAFXDS0  7718 LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 730   2014-12-11   
951-523 4 Corona CA ONTRCAFXDS0  7718 LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 730   2014-12-11   
951-523 5 Corona CA ONTRCAFXDS0  7718 LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 730   2014-12-11   
951-523 6 Corona CA ONTRCAFXDS0  7718 LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 730   2014-12-11   
951-523 7 Corona CA LSANCA039MD  981E BANDWIDTH.COM CLEC, LLC - CA 730   2015-02-15   
951-523 8 Corona CA LSANCA039MD  981E BANDWIDTH.COM CLEC, LLC - CA 730   2015-02-15   
951-523 9 Corona CA TRNECAGB7MD  6529 T-MOBILE USA, INC. 730   2015-02-06   

Last updated: Thu, 16 Oct 2025 03:04:18 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.