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: 925 [Rate centres in NPA 925] [Dial plan for NPA 925]

NXX: 230

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
925-230 A Dublin-San Ramon CA SNFCCASY5MD  8826 LEVEL 3 COMMUNICATIONS, LLC - CA 722      
925-230 0 Dublin-San Ramon CA SNFCCASY5MD  8826 LEVEL 3 COMMUNICATIONS, LLC - CA 722   2011-04-30   
925-230 1 Dublin-San Ramon CA SNFCCAMKDS3  649C ONVOY, LLC - CA 722   2007-09-07   
925-230 2 Dublin-San Ramon CA SNFCCASY5MD  8826 LEVEL 3 COMMUNICATIONS, LLC - CA 722      
925-230 3 Dublin-San Ramon CA SNFCCA21XUY  981E BANDWIDTH.COM CLEC, LLC - CA 722   2020-11-08   
925-230 4 Dublin-San Ramon CA SNFCCA21XUY  981E BANDWIDTH.COM CLEC, LLC - CA 722   2020-11-08   
925-230 5 Dublin-San Ramon CA SNFCCAMKX9X  073H TELNYX LLC 722   2020-11-26   
925-230 6 Dublin-San Ramon CA OKLDCAMPDS0  4733 PAETEC COMMUNICATIONS, INC. - CA 722   2009-04-28   
925-230 7 Dublin-San Ramon CA OKLECAZVGT0  6529 T-MOBILE USA, INC. 722   2020-09-21   
925-230 8 Dublin-San Ramon CA SNFCCA01XGX  516C AT&T CORP. 722   2006-06-30   
925-230 9 Dublin-San Ramon CA SNFCCASY5MD  8826 LEVEL 3 COMMUNICATIONS, LLC - CA 722   2009-06-23   

Last updated: Tue, 04 May 2021 15:04:27 UTC

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.