Any way to IP ban a player from your game?

So i'm looking for a method to IP ban any player from your game since today a user of mine reported that an exploiter was constantly killing him in the games lobby. Well i didn't ban him yet since he will just use an alt account but i were wondering if i actually can get completely rid of him? He was really toxic to me and i got really mad so i really wanted to get rid of him from the game ASAP.

PS. I can't add an anti-cheat to the game since it's a script fighting game and the anti-cheat will absolutely destroy the game making you unable to do litteraly anything.

Hello! You cannot do IP bans as if you do your game violates Roblox's TOS and you'll be terminated. It's also extremely difficult to even access IPs of roblox Player's in general. The best thing you can do to prevent the exploiter from joining is by inserting whitelisting systems or making it so that you must be a certain account age to join.

if he can use alt account, he can use alt ip. why don't you ban player killing each other in the lobby.

I put weapon shoot script in the place. in the lobby, the script is not there. no one can shoot