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.

Switch: SNFCCASY5MD

<< 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
925-887 9 Concord CA 8826 LEVEL 3 COMMUNICATIONS, LLC - CA 722   2005-01-27   
925-889 0 Clayton CA 8826 LEVEL 3 COMMUNICATIONS, LLC - CA 722      
925-891 3 Walnut Creek CA 8826 LEVEL 3 COMMUNICATIONS, LLC - CA 722      
925-891 8 Walnut Creek CA 8826 LEVEL 3 COMMUNICATIONS, LLC - CA 722      
925-892 3 Pleasanton CA 8826 LEVEL 3 COMMUNICATIONS, LLC - CA 722   2014-05-04   
925-918 4 Pleasanton CA 8826 LEVEL 3 COMMUNICATIONS, LLC - CA 722   2016-01-30   
925-918 6 Pleasanton CA 8826 LEVEL 3 COMMUNICATIONS, LLC - CA 722   2014-10-26   
925-931 8 Pleasanton CA 8826 LEVEL 3 COMMUNICATIONS, LLC - CA 722   2012-03-05   
925-948 8 Walnut Creek CA 8826 LEVEL 3 COMMUNICATIONS, LLC - CA 722   2010-11-20   
925-961 3 Livermore CA 8826 LEVEL 3 COMMUNICATIONS, LLC - CA 722   2012-04-07   
925-961 5 Livermore CA 8826 LEVEL 3 COMMUNICATIONS, LLC - CA 722   2012-07-19   
925-962 5 Lafayette CA 8826 LEVEL 3 COMMUNICATIONS, LLC - CA 722   2011-11-28   
925-965 0 Pleasanton CA 8826 LEVEL 3 COMMUNICATIONS, LLC - CA 722   2009-11-12   
925-965 7 Pleasanton CA 8826 LEVEL 3 COMMUNICATIONS, LLC - CA 722   2010-04-04   
925-968 4 Bishop Ranch CA 8826 LEVEL 3 COMMUNICATIONS, LLC - CA 722   2012-09-08   

<< 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23

Last updated: Sat, 01 Aug 2026 03:19:33 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.