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
312-242 A Chicago Zone 01-Wabash IL CHCGILCGDS1  7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 358      
312-242 0 Chicago Zone 01-Wabash IL   7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 358      
312-242 1 Chicago Zone 01-Wabash IL   7721 BROADWING COMMUNICATIONS, LLC - IL 358   2000-10-13   
312-242 2 Chicago Zone 01-Wabash IL   4604 FIRST COMMUNICATIONS LLC - IL 358   2002-07-03   
312-242 3 Chicago Zone 01-Wabash IL   7721 BROADWING COMMUNICATIONS, LLC - IL 358   2002-04-23   
312-242 4 Chicago Zone 01-Wabash IL   4604 FIRST COMMUNICATIONS LLC - IL 358   2001-07-09   
312-242 5 Chicago Zone 01-Wabash IL   7721 BROADWING COMMUNICATIONS, LLC - IL 358   2001-01-17   
312-242 6 Chicago Zone 01-Wabash IL   4604 FIRST COMMUNICATIONS LLC - IL 358   2001-07-09   
312-242 7 Chicago Zone 01-Wabash IL   7721 BROADWING COMMUNICATIONS, LLC - IL 358   2000-11-20   
312-242 8 Chicago Zone 01-Wabash IL   4604 FIRST COMMUNICATIONS LLC - IL 358   2001-07-09   
312-242 9 Chicago Zone 01-Wabash IL   4604 FIRST COMMUNICATIONS LLC - IL 358   2001-07-09   

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

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.