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: 312 [Rate centres in NPA 312] [Dial plan for NPA 312]

NXX:

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
312-554 A Chicago Zone 01-Wabash IL CHCGILWBDS0  9329 AMERITECH ILLINOIS 358      
312-554 0 Chicago Zone 01-Wabash IL   9329 AMERITECH ILLINOIS 358      
312-554 1 Chicago Zone 01-Wabash IL   9329 AMERITECH ILLINOIS 358      
312-554 2 Chicago Zone 01-Wabash IL   9329 AMERITECH ILLINOIS 358      
312-554 3 Chicago Zone 01-Wabash IL   9329 AMERITECH ILLINOIS 358      
312-554 4 Chicago Zone 01-Wabash IL   9329 AMERITECH ILLINOIS 358      
312-554 5 Chicago Zone 01-Wabash IL   984E BANDWIDTH.COM CLEC, LLC - IL 358   2010-03-04   
312-554 6 Chicago Zone 01-Wabash IL   7056 XO ILLINOIS, INC. 358   2011-01-05   
312-554 7 Chicago Zone 01-Wabash IL   9329 AMERITECH ILLINOIS 358      
312-554 8 Chicago Zone 01-Wabash IL   9329 AMERITECH ILLINOIS 358      
312-554 9 Chicago Zone 01-Wabash IL   6664 SPRINT SPECTRUM L.P. 358   2011-01-05   

Last updated: Sun, 10 Nov 2019 13:49:34 UTC

Sponsored by: VoiceMeUp - Corporate VoIP Services

Like this site? We accept donations via PayPal.