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
312-235 A Chicago Zone 01-Wabash IL CHCGILWBDS2  9329 AMERITECH ILLINOIS 358      
312-235 0 Chicago Zone 01-Wabash IL   9329 AMERITECH ILLINOIS 358      
312-235 1 Chicago Zone 01-Wabash IL   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358   2008-04-11   
312-235 2 Chicago Zone 01-Wabash IL   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358   2005-12-08   
312-235 3 Chicago Zone 01-Wabash IL   4717 PAETEC COMMUNICATIONS, INC. - IL 358   2005-11-08   
312-235 4 Chicago Zone 01-Wabash IL   4604 FIRST COMMUNICATIONS LLC - IL 358   2005-11-27   
312-235 5 Chicago Zone 01-Wabash IL   4604 FIRST COMMUNICATIONS LLC - IL 358   2005-11-27   
312-235 6 Chicago Zone 01-Wabash IL   6115 LEVEL 3 COMMUNICATIONS, LLC - IL 358   2005-12-08   
312-235 7 Chicago Zone 01-Wabash IL   9329 AMERITECH ILLINOIS 358      
312-235 8 Chicago Zone 01-Wabash IL   9329 AMERITECH ILLINOIS 358      
312-235 9 Chicago Zone 01-Wabash IL   6333 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 358   2010-08-16   

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

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.