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.
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Switch: FSTNILXARS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
815-938 A Forreston IL 1036 FRONTIER NORTH, INC. - IL 360      
815-938 2 Forreston IL 1036 FRONTIER NORTH, INC. - IL 360      
815-938 3 Forreston IL 1036 FRONTIER NORTH, INC. - IL 360      
815-938 9 Forreston IL 1036 FRONTIER NORTH, INC. - IL 360      

Last updated: Thu, 20 Nov 2025 13:34:34 UTC

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