Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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Chicago Zone 01-Illinois Dearborn, IL

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NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
312-817 A CHCGILIDDS0  9329 ILLINOIS BELL TEL CO 358      
312-822 A CHCGILIDDS0  9329 ILLINOIS BELL TEL CO 358      
312-828 A CHCGILIDDS0  9329 ILLINOIS BELL TEL CO 358      
312-832 A CHCGILIDDS0  9329 ILLINOIS BELL TEL CO 358      
312-836 A CHCGILIDDS0  9329 ILLINOIS BELL TEL CO 358      
312-840 A CHCGILIDDS0  9329 ILLINOIS BELL TEL CO 358      
312-923 A CHCGILIDDS0  9329 ILLINOIS BELL TEL CO 358      
312-955 A CHCGILACGT0  8702 RCN TELECOM SERVICES OF ILLINIOS, INC. - IL 358      
312-970 A CHCGILIDDS0  9329 ILLINOIS BELL TEL CO 358      
312-970 0 CHCGILWBXDZ  984E BANDWIDTH.COM CLEC, LLC - IL 358   2009-01-13   
312-970 1 CHCGILWBXDZ  984E BANDWIDTH.COM CLEC, LLC - IL 358   2010-03-04   
312-970 2 CHCGILIDDS0  9329 ILLINOIS BELL TEL CO 358      
312-970 3 CHCGILIDDS0  9329 ILLINOIS BELL TEL CO 358      
312-970 4 CHCGILMF4MD  5562 METROPCS, INC. 358   2016-12-29   
312-970 5 CHCGILIDDS0  9329 ILLINOIS BELL TEL CO 358      
312-970 6 CHCGILMF4MD  5562 METROPCS, INC. 358   2017-01-23   
312-970 7 CHCGILSUDS2  9329 ILLINOIS BELL TEL CO 358   2001-04-23   
312-970 8 CHCGILIDDS0  9329 ILLINOIS BELL TEL CO 358      
312-970 9 CHCGILWBXDZ  984E BANDWIDTH.COM CLEC, LLC - IL 358   2009-01-13   

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Last updated: Tue, 16 Apr 2024 01:38:01 UTC

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