Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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Concord, MI

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
517-524 A CNCRMIXJDS0  4417 FRONTIER COMMUNICATIONS OF MICHIGAN, INC. 346      
517-895 A MDTPMICODS0  3535 ACD TELECOM, INC. - MI 346      
517-895 0   624H ONVOY SPECTRUM, LLC 346   2024-05-03   
517-895 1   543C ONVOY, LLCV - MI 346   2021-07-28   
517-895 2   770E TELEPORT COMMUNICATIONS AMERICA, LLC - MI 346   2016-02-15   
517-895 3   3535 ACD TELECOM, INC. - MI 346      
517-895 4   318J COMCAST IP PHONE, LLC 346   2008-12-28   
517-895 5   543C ONVOY, LLCV - MI 346   2021-07-28   
517-895 6   961J WOW! INTERNET, CABLE AND PHONE 346   2012-05-20   
517-895 8   543C ONVOY, LLCV - MI 346   2018-10-12   
517-895 9   991E BANDWIDTH.COM CLEC, LLC - MI 346   2024-09-14   

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

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