Solvedirratating player on ghosts PC

last few days i have had this kid just continue to follow me because i reported him for hacking which he was. and its starting to get on my nerve, cant even have a game anymore. i know how to DDos people just by using CMD, which is pretty easy. but i cant remember how to retrieve this kid's IP address, if someone might have a idea or know can they tell me.

thanks for reading