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: 951 [Rate centres in NPA 951] [Dial plan for NPA 951]

NXX: 828

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
951-828 A Arlington CA   7139 TELEPORT COMMUNICATIONS AMERICA, LLC - CA 730   2026-11-16   
951-828 6 Arlington CA   7139 TELEPORT COMMUNICATIONS AMERICA, LLC - CA 730   2026-11-16   
951-828 7 Arlington CA   824J OPENTACT INC. 730   2026-11-17   

Last updated: Sat, 10 Oct 2026 15:24:20 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.