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: CHCGILIDXDX

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
872-710 A Chicago Zone 01-Calumet IL 624H ONVOY SPECTRUM, LLC 358      
872-877 A Chicago Zone 04-Humboldt IL 624H ONVOY SPECTRUM, LLC 358   2021-04-07   

Last updated: Fri, 01 Jul 2022 02:53:40 UTC

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