Hi.
Two days ago admins & i faced a kid who had dynamic ips or at least was using VPN services to change his ip.
Now,those who have FTP access can simply add the IP string on blacklist.ini which can be found at configs folder.
Example:
IPS contain 4 sets of numbers. If 3 of them are completly same as listed on blacklist.ini , they get banned as soon as they join the server.
185.104.184.XXX , 91.195.99.XXX get banned whatever the last numbers on his IP are.