[Dreftas]

For example there are 10 bots with IP's:
155.142.13.1
155.142.13.2
155.142.13.3
155.142.13.4
155.142.13.5
155.142.13.6
155.142.13.7
155.142.13.8
155.142.13.9
155.142.13.10

use /rcon ban 155.142.13.* and all IP's starting with 155.142.13 will be banned. Also you can do 155.142.*.* or 155.*.*.* and so on.