the server in this game hardly kicked hackers which sucks because all hackers can just come back in if there was a IP ban the hackers griefers etc could get banned and not join another server or change their name is it possible to get a IP ban in this game

Yes. If people are running a vanilla server, they have to blacklist the person's IP in their firewall. This is pretty inconvenient.

If the server is running pyspades, they can ban people by IP ingame and submit the it to the global blacklist if they choose to. If the pyspades server is subscribed to anyone's blacklist, the people blacklisted will not be able to join the server.

so your saying people who own the server can IP ban someone

vanilla server will have better admin control soon, most likely in next release