The only list I found appears to be old (only has DOCSIS 2.0 modems):
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www.myinsight.com/Help-b ··· 7105.aspI would recommend getting a DOCSIS 3.0 modem. I currently have the Motorola SB6121, which is on TWC's approved modem list, and have the 20.0 service and everything has been rock solid.
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www.timewarnercable.com/ ··· dem.htmlOnce you have your new modem hooked up you will need to call Insight and provide them with the MAC address so it can be provisioned on your account.