Use a Sniffer.
I wonder why people who are new to ip finding bother trying. I mean look, for example, I could threaten to ddos you all I want and you can get my "Ip-address" but what good does that do you if I'm on a VPN? Hell I could be in Africa but using American based IP.
and even if this is a legit ip you finding out that information and then doing something to the kid is cyber bullying and a federal crime. hope you don't drop that bar of soap in federal prison cuz it ain't nothin like state/county prisons.
and there's visual evidence here that ties you to the crime scene lol?