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: 904 [Rate centres in NPA 904] [Dial plan for NPA 904]

NXX: 231

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
904-231 A St Johns FL JCVMFL37CM0  9748 AMERICAN MESSAGING SERVICES, LLC 45204      

Last updated: Sun, 07 Feb 2021 01:52:50 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.