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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Chicago Zone 03-Kildare, IL

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NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
872-946 7 CHCGILCLXOX  516C AT&T CORP. 358   2022-04-01   
872-946 8 SCBGILRRGT1  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 358   2022-04-25   
872-946 9 OKBRILOAXEX  7136 TELEPORT COMMUNICATIONS AMERICA, LLC - IL 358   2022-05-25   

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

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