For vbulletin there was this awesome modification that checked the ip addresses of users and warned the staff of a forum when a banned or duplicate user was detected. Is there somet available for Xenforo as well that does the same. We have a few problematic members from the past that have registered again when we migrated to xenforo and by their posting style it was quite obvious who they were. However a simply ip tool with an automatic warning system would save tons of time. Any ideas?