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: 323 [Rate centres in NPA 323] [Dial plan for NPA 323]


NPA-NXX BLOCK Rate Centre Region Switch OCN LATA Eff date Disc date Map
323-939 A Los Angeles: DA 13 CA LSANCA10DS1  9740 PACIFIC BELL 730     map

Last updated: Sat, 17 Mar 2018 02:08:30 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.