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: DKLBILRS0MD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
779-334 A De Kalb IL 6115 LEVEL 3 COMMUNICATIONS, LLC - IL 364      
779-355 A Harmon IL 6115 LEVEL 3 COMMUNICATIONS, LLC - IL 364      
815-380 A Sterling IL 6115 LEVEL 3 COMMUNICATIONS, LLC - IL 364      
815-881 A Oregon IL 6115 LEVEL 3 COMMUNICATIONS, LLC - IL 364      
815-888 A Rochelle IL 6115 LEVEL 3 COMMUNICATIONS, LLC - IL 364      
815-981 A De Kalb IL 6115 LEVEL 3 COMMUNICATIONS, LLC - IL 364      

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

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