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: DKLBILXAPS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
815-754 A De Kalb IL 1036 FRONTIER NORTH, INC. - IL 364      
815-946 8 Polo IL 1036 FRONTIER NORTH, INC. - IL 364      

Last updated: Tue, 01 Sep 2026 00:40:05 UTC

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