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: SNVACAHZ0MD

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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
925-490 7 Concord CA 508J CENTURYLINK COMMUNICATIONS, LLC 722   2014-08-08   
925-583 7 Livermore CA 508J CENTURYLINK COMMUNICATIONS, LLC 722   2013-06-24   
925-587 7 Dublin-San Ramon CA 508J CENTURYLINK COMMUNICATIONS, LLC 722   2014-03-28   
925-635 7 Pittsburg CA 508J CENTURYLINK COMMUNICATIONS, LLC 722   2014-04-09   
925-643 7 Pittsburg West CA 508J CENTURYLINK COMMUNICATIONS, LLC 722   2015-02-02   
925-678 7 Danville CA 508J CENTURYLINK COMMUNICATIONS, LLC 722   2013-06-24   
925-679 6 East Contra Costa CA 508J CENTURYLINK COMMUNICATIONS, LLC 722   2014-03-28   
925-701 7 Pleasanton CA 508J CENTURYLINK COMMUNICATIONS, LLC 722   2013-06-25   
925-794 7 Moraga CA 508J CENTURYLINK COMMUNICATIONS, LLC 722   2014-06-09   
925-844 7 Clayton CA 508J CENTURYLINK COMMUNICATIONS, LLC 722   2014-05-27   
925-862 7 Sunol CA 508J CENTURYLINK COMMUNICATIONS, LLC 722   2014-06-09   
925-871 7 Lafayette CA 508J CENTURYLINK COMMUNICATIONS, LLC 722   2014-03-28   

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Last updated: Thu, 05 Feb 2026 23:41:55 UTC

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