Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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Strawn, IL

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
815-688 A STRWILXARS0  1015 FRONTIER NORTH, INC. - IL 366      
815-688 1   073H TELNYX LLC 366   2020-07-20   
815-688 2   624H ONVOY SPECTRUM, LLC 366   2023-06-02   
815-688 3   1015 FRONTIER NORTH, INC. - IL 366      
815-688 4   846F MEDIACOM TELEPHONY OF ILLINOIS, LLC - IL 366   2016-06-02   
815-688 5   495J STRATUS NETWORKS 366   2020-10-14   
815-688 6   224C ONVOY, LLC 366   2019-01-17   
815-688 7   508J CENTURYLINK COMMUNICATIONS, LLC 366   2014-08-13   
815-688 8   224C ONVOY, LLC 366   2019-07-15   
815-688 9   224C ONVOY, LLC 366   2019-07-15   

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

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