Board Thread:Support Requests - Community Management/@comment-1713281-20131002215114/@comment-5251339-20131002233438

You should ask Staff to run an IP check via Special:Contact/general, assuming that's what you are asking. If you checked the "Prevent logged-in users from editing from this IP address" and "Prevent account creation" boxes at Special:Block, it should automatically block all accounts that user logs into on that wiki. If this is ineffective, this means that if it is indeed the same user, they would be switching IP addressed (i.e. getting onto a different device or computer).