Hi,
You could use this Mod to do that.
https://vborg.vbsupport.ru/showthread.php?p=1085503
Quote:
Description
When an user registers, this plugin checks for the cookie that the AE Detector sets, if it exists, then this plugin will move the user to a specified usergroup (default is to the (COPPA) Users Awaiting Moderation usergroup). This will now check the user's IP address upon registration, and if it matches any others, it will place them in the Multiple Account (MA) usergroup . Also you have the option to ban the new account if the old account was banned.
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I allready had some users placing themselves into the MU group.
Christian