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: 644

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
925-644 A Concord CA SNJUCACL7MD  965H FRACTEL, LLC 722      
925-644 0 Concord CA   981E BANDWIDTH.COM CLEC, LLC - CA 722   2021-09-13   
925-644 1 Concord CA   981E BANDWIDTH.COM CLEC, LLC - CA 722   2021-09-13   
925-644 2 Concord CA   981E BANDWIDTH.COM CLEC, LLC - CA 722   2021-09-13   
925-644 3 Concord CA   981E BANDWIDTH.COM CLEC, LLC - CA 722   2021-09-13   
925-644 4 Concord CA   965H FRACTEL, LLC 722   2021-09-12   
925-644 5 Concord CA   649C ONVOY, LLC - CA 722   2021-09-13   
925-644 6 Concord CA   649C ONVOY, LLC - CA 722   2021-09-13   
925-644 7 Concord CA   981E BANDWIDTH.COM CLEC, LLC - CA 722   2021-09-13   
925-644 8 Concord CA   073H TELNYX LLC 722   2021-11-07   
925-644 9 Concord CA   553J WHITESKY COMMUNICATIONS, LLC 722   2021-09-16   

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

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.