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: 603

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
925-603 A Concord CA CNCRCA01DS1  9740 PACIFIC BELL 722      
925-603 0 Concord CA CNCRCA01DS1  9740 PACIFIC BELL 722      
925-603 1 Concord CA CNCRCA01DS1  9740 PACIFIC BELL 722      
925-603 2 Concord CA CNCRCA01DS1  9740 PACIFIC BELL 722      
925-603 3 Concord CA SNFCCA21XUY  981E BANDWIDTH.COM CLEC, LLC - CA 722   2010-03-04   
925-603 4 Concord CA SNJUCACLDS1  373F PEERLESS NETWORK OF CALIFORNIA, LLC - CA 722   2019-05-26   
925-603 5 Concord CA CNCRCA01DS1  9740 PACIFIC BELL 722      
925-603 6 Concord CA CNCRCA01DS1  9740 PACIFIC BELL 722      
925-603 7 Concord CA CNCRCA01DS1  9740 PACIFIC BELL 722      
925-603 8 Concord CA CNCRCA01DS1  9740 PACIFIC BELL 722      
925-603 9 Concord CA CNCRCA01DS1  9740 PACIFIC BELL 722      

Last updated: Tue, 16 Apr 2024 01:38:01 UTC

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.