In order to make this work, you will need to check each user's hostmask when they join and then store than data somewhere (probably a hash table), and then when there are enough users from a certain host, some action can be taken. You need to decide what your criteria are for considering a group of people to be clones? Do they all have to have identical [email]ident@host.masks[/email], or similar nicknames (nick12345, nick23456, etc), or identical *@*wild.host.masks ?

-genius_at_work