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.

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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
447-231 A Chatham IL 939H COMMIO, LLC 374      
447-231 1 Chatham IL 939H COMMIO, LLC 374   2022-06-16   
447-231 8 Chatham IL 939H COMMIO, LLC 374   2024-02-02   
447-231 9 Chatham IL 939H COMMIO, LLC 374   2024-02-02   

Last updated: Sat, 15 Nov 2025 03:38:44 UTC

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