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:

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
925-524 A Clayton CA CYTNCA11DS0  9740 PACIFIC BELL 722      
925-524 0 Clayton CA   9740 PACIFIC BELL 722      
925-524 2 Clayton CA   7262 XO CALIFORNIA, INC. 722   2006-10-01   
925-524 3 Clayton CA   7240 MCI WORLDCOM COMMUNICATIONS, INC., CA 722   2008-07-24   
925-524 6 Clayton CA   7240 MCI WORLDCOM COMMUNICATIONS, INC., CA 722   2012-01-12   
925-524 7 Clayton CA   649C ONVOY, LLC - CA 722   2009-12-18   

Last updated: Sun, 10 Nov 2019 13:49:34 UTC

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.