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.
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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
925-305 2 Concord CA 7718 LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 722      
925-307 A Dublin-San Ramon CA 7718 LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 722      
925-307 1 Dublin-San Ramon CA 7718 LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 722      
925-308 A East Contra Costa CA 7718 LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 722      
925-308 1 East Contra Costa CA 7718 LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 722      
925-309 A Danville CA 7718 LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 722      
925-309 1 Danville CA 7718 LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 722      
925-310 A Lafayette CA 7718 LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 722      
925-310 1 Lafayette CA 7718 LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 722      
925-315 A Livermore CA 7718 LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 722      
925-315 3 Livermore CA 7718 LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 722      
925-318 A Pittsburg CA 7718 LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 722      
925-318 3 Pittsburg CA 7718 LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 722      
925-359 3 Bishop Ranch CA 7718 LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 722   2013-09-07   
925-379 A Pleasanton CA 7718 LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 722      
925-475 1 Pleasanton CA 7718 LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 722      
925-475 2 Pleasanton CA 7718 LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 722      
925-543 4 Bishop Ranch CA 7718 LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 722   2014-05-16   
925-660 A Pleasanton CA 7718 LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 722      
925-660 1 Pleasanton CA 7718 LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 722      
925-660 3 Pleasanton CA 7718 LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 722      
925-660 4 Pleasanton CA 7718 LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 722   2013-04-08   
925-701 4 Pleasanton CA 7718 LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 722   2014-04-03   
925-701 5 Pleasanton CA 7718 LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 722   2014-04-03   
925-701 6 Pleasanton CA 7718 LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 722   2014-04-03   
925-758 7 Livermore CA 7718 LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 722   2020-04-04   
925-843 A Bishop Ranch CA 7718 LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 722      
925-953 A Walnut Creek CA 7718 LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 722      
925-953 1 Walnut Creek CA 7718 LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 722      
925-953 5 Walnut Creek CA 7718 LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 722      
925-953 6 Walnut Creek CA 7718 LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 722      
925-953 7 Walnut Creek CA 7718 LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 722      
925-953 9 Walnut Creek CA 7718 LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 722      
925-968 7 Bishop Ranch CA 7718 LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 722   2013-05-07   

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

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