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.

Chicago Zone 01-Canal, IL

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NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
312-993 A CHCGILCLDS0  9329 ILLINOIS BELL TEL CO 358      
312-993 0 CHCGILCLDS0  9329 ILLINOIS BELL TEL CO 358      
312-993 1 CHCGILCLDS0  9329 ILLINOIS BELL TEL CO 358      
312-993 2 CHCGILCLDS0  9329 ILLINOIS BELL TEL CO 358      
312-993 3 CHCGILCLDS0  9329 ILLINOIS BELL TEL CO 358      
312-993 4 CHCGILCLDS0  9329 ILLINOIS BELL TEL CO 358      
312-993 5 CHCGILCLDS0  9329 ILLINOIS BELL TEL CO 358      
312-993 6 CHCGILCLDS0  9329 ILLINOIS BELL TEL CO 358      
312-993 7 CHCGILCLDS0  9329 ILLINOIS BELL TEL CO 358      
312-993 8 CHCGILCLDS0  9329 ILLINOIS BELL TEL CO 358      
312-993 9 CHCGILIDXDX  624H ONVOY SPECTRUM, LLC 358   2022-01-07   

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Last updated: Thu, 04 Aug 2022 23:14:42 UTC

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