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: CHCGILPMDS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
773-284 A Chicago Zone 08-Portsmouth IL 9329 AMERITECH ILLINOIS 358      
773-581 A Chicago Zone 08-Portsmouth IL 9329 AMERITECH ILLINOIS 358      
773-582 A Chicago Zone 08-Portsmouth IL 9329 AMERITECH ILLINOIS 358      
773-585 A Chicago Zone 08-Portsmouth IL 9329 AMERITECH ILLINOIS 358      
773-735 A Chicago Zone 08-Portsmouth IL 9329 AMERITECH ILLINOIS 358      
773-767 A Chicago Zone 08-Portsmouth IL 9329 AMERITECH ILLINOIS 358      
773-838 A Chicago Zone 08-Portsmouth IL 9329 AMERITECH ILLINOIS 358      
773-884 A Chicago Zone 08-Portsmouth IL 9329 AMERITECH ILLINOIS 358      

Last updated: Sat, 31 Oct 2020 19:28:10 UTC

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