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: 681

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
925-681 A Concord CA CNCRCA01DS1  9740 PACIFIC BELL 722      
925-681 0 Concord CA   9740 PACIFIC BELL 722      
925-681 1 Concord CA   9740 PACIFIC BELL 722      
925-681 2 Concord CA   9740 PACIFIC BELL 722      
925-681 3 Concord CA   9740 PACIFIC BELL 722      
925-681 4 Concord CA   9740 PACIFIC BELL 722      
925-681 5 Concord CA   9740 PACIFIC BELL 722      
925-681 6 Concord CA   9740 PACIFIC BELL 722      
925-681 7 Concord CA   9740 PACIFIC BELL 722      
925-681 8 Concord CA   6010 NEW CINGULAR WIRELESS PCS, LLC 722   2009-09-17   
925-681 9 Concord CA   6010 NEW CINGULAR WIRELESS PCS, LLC 722   2009-09-17   

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.