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
312-788 A Chicago Zone 01-Wabash IL CHCGILWBDS2  9329 AMERITECH ILLINOIS 358      
312-788 0 Chicago Zone 01-Wabash IL   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 358   2009-01-27   
312-788 1 Chicago Zone 01-Wabash IL   4604 FIRST COMMUNICATIONS LLC - IL 358   2011-06-20   
312-788 2 Chicago Zone 01-Wabash IL   4604 FIRST COMMUNICATIONS LLC - IL 358   2014-04-16   
312-788 3 Chicago Zone 01-Wabash IL   9329 AMERITECH ILLINOIS 358      
312-788 4 Chicago Zone 01-Wabash IL   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 358   2009-01-27   
312-788 5 Chicago Zone 01-Wabash IL   9329 AMERITECH ILLINOIS 358      
312-788 6 Chicago Zone 01-Wabash IL   7575 CENTURYLINK COMMUNICATIONS LLC 358   2016-03-28   
312-788 7 Chicago Zone 01-Wabash IL   984E BANDWIDTH.COM CLEC, LLC - IL 358   2010-03-04   
312-788 8 Chicago Zone 01-Wabash IL   259E YMAX COMMUNICATIONS CORP. - IL 358   2008-08-29   
312-788 9 Chicago Zone 01-Wabash IL   259E YMAX COMMUNICATIONS CORP. - IL 358   2008-08-29   

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

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.