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 08-Prospect, IL

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
773-434 A CHCGILPRDS0  9329 ILLINOIS BELL TEL CO 358      
773-436 A CHCGILPRDS0  9329 ILLINOIS BELL TEL CO 358      
773-471 A CHCGILPRDS0  9329 ILLINOIS BELL TEL CO 358      
773-476 A CHCGILPRDS0  9329 ILLINOIS BELL TEL CO 358      
773-737 A CHCGILPRDS0  9329 ILLINOIS BELL TEL CO 358      
773-776 A CHCGILPRDS0  9329 ILLINOIS BELL TEL CO 358      
773-778 A CHCGILPRDS0  9329 ILLINOIS BELL TEL CO 358      
773-863 A CHCGILPRDS0  9329 ILLINOIS BELL TEL CO 358      
773-863 0 CHCGILPRDS0  9329 ILLINOIS BELL TEL CO 358      
773-863 1 CHCGILPRDS0  9329 ILLINOIS BELL TEL CO 358      
773-863 2 ELGNILOTGT5  6529 T-MOBILE USA, INC. 358   2012-10-05   
773-863 3 CHCGIL24DS6  224C ONVOY, LLC 358   2013-07-31   
773-863 4 CHCGILPRDS0  9329 ILLINOIS BELL TEL CO 358      
773-863 5 CHCGILPRDS0  9329 ILLINOIS BELL TEL CO 358      
773-863 6 CHCGILPRDS0  9329 ILLINOIS BELL TEL CO 358      
773-863 7 CHCGILPRDS0  9329 ILLINOIS BELL TEL CO 358      
773-863 8 CHCGILPRDS0  9329 ILLINOIS BELL TEL CO 358      
773-863 9 CHCGILPRDS0  9329 ILLINOIS BELL TEL CO 358      
773-918 A CHCGILPRDS0  9329 ILLINOIS BELL TEL CO 358      
773-918 0 CHCGILPRDS0  9329 ILLINOIS BELL TEL CO 358      
773-918 1 CHCGILPRDS0  9329 ILLINOIS BELL TEL CO 358      
773-918 2 CHCGIL24DS6  224C ONVOY, LLC 358   2016-03-07   
773-918 3 CHCGILPRDS0  9329 ILLINOIS BELL TEL CO 358      
773-918 4 CHCGILPRDS0  9329 ILLINOIS BELL TEL CO 358      
773-918 5 ELGNILOTGT5  6529 T-MOBILE USA, INC. 358   2007-03-19   
773-918 6 CHCGILPRDS0  9329 ILLINOIS BELL TEL CO 358      
773-918 7 CHCGILPRDS0  9329 ILLINOIS BELL TEL CO 358      
773-918 8 CHCGILPRDS0  9329 ILLINOIS BELL TEL CO 358      
773-918 9 ELGNILOTGT5  6529 T-MOBILE USA, INC. 358   2007-03-19   
773-925 A CHCGILPRDS0  9329 ILLINOIS BELL TEL CO 358      

Last updated: Sun, 27 Apr 2025 12:48:38 UTC

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