Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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NPA: 517 [Rate centres in NPA 517] [Dial plan for NPA 517]

NXX: 992

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
517-992 A Williamston MI LNNGMIMNX3Y  2550 123.NET, LLC 346      
517-992 0 Williamston MI LNNGMIMNX3Y  2550 123.NET, LLC 346   2003-04-20   
517-992 1 Williamston MI LNNGMIMNX4Z  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 346   2004-12-31   
517-992 2 Williamston MI   145J TERRA NOVA TELECOM INC. 346   2025-05-31   
517-992 3 Williamston MI LNNGMIMNX8Z  770E TELEPORT COMMUNICATIONS AMERICA, LLC - MI 346   2016-09-06   
517-992 4 Williamston MI LNNGMIMN02Z  318J COMCAST IP PHONE, LLC 346   2008-12-26   
517-992 5 Williamston MI LNNGMIVE2MD  6120 LEVEL 3 COMMUNICATIONS, LLC - MI 346   2009-12-07   
517-992 6 Williamston MI LNNGMIMNX5Z  543C ONVOY, LLCV - MI 346   2011-01-08   
517-992 7 Williamston MI LNNGMIMNX5Z  543C ONVOY, LLCV - MI 346   2013-04-05   
517-992 8 Williamston MI LNNGMIMN00Z  624H ONVOY SPECTRUM, LLC 346   2021-06-17   
517-992 9 Williamston MI LNNGMIVE2MD  6120 LEVEL 3 COMMUNICATIONS, LLC - MI 346   2007-07-26   

Last updated: Thu, 16 Oct 2025 03:04:18 UTC

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