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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OCN: 063E PEERLESS NETWORK OF ILLINOIS, LLC - IL

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NPA-NXX BLOCK Rate Centre Region Switch LATA LIR Eff date Disc date
872-873 6 Chicago Zone 11-O'Hare IL CHCGILWUDS4  358   2020-10-26   
872-895 9 Chicago Zone 01-Calumet IL CHCGILWUDS4  358   2021-01-07   

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Last updated: Tue, 31 Mar 2026 13:56:49 UTC

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