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.

Switch: CHCGILTCDS4

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
224-330 A Northbrook IL 7056 XO ILLINOIS, INC. 358   2005-11-19   
224-400 A Arlington Heights IL 7056 XO ILLINOIS, INC. 358   2010-12-26   
312-284 A Chicago Zone 01-Franklin IL 7056 XO ILLINOIS, INC. 358      
331-462 A Lombard IL 7056 XO ILLINOIS, INC. 358   2008-10-31   
630-405 A Aurora IL 7056 XO ILLINOIS, INC. 358      
708-433 A Beecher IL 7056 XO ILLINOIS, INC. 358   2006-01-07   
815-321 A Woodstock IL 7056 XO ILLINOIS, INC. 358      

Last updated: Sat, 11 Jul 2020 20:37:26 UTC

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