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.

Switch: LSANCAJW2MD

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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
951-423 7 Perris CA 508J CENTURYLINK COMMUNICATIONS, LLC 730   2014-09-01   
951-643 6 Arlington CA 508J CENTURYLINK COMMUNICATIONS, LLC 730   2013-03-11   
951-744 6 Hemet: Anza DA CA 508J CENTURYLINK COMMUNICATIONS, LLC 730   2014-06-27   
951-749 7 Mira Loma CA 508J CENTURYLINK COMMUNICATIONS, LLC 730   2013-03-13   
951-900 2 Riverside CA 508J CENTURYLINK COMMUNICATIONS, LLC 730   2013-03-13   

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Last updated: Tue, 29 Sep 2026 03:00:13 UTC

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