how to find the ip of players in your server

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    ive created a server a few weeks ago for me and my friends and judt yestarday some random guy joined our server,somehow went into creative and started destroying our stuff and griefing out bases, we tried to ban him but he just came for another acc and did the same thing over so i was wondering how i could find out his ip and ip ban him so that i can put a stop to his shenanigans