Thread:Old McDonald/@comment-10733658-20150517013707/@comment-24494906-20150517014558

There's no method. Only Wikia staff have access to that kind of information.

However, if you suspect one IP address to be connected to that account, then you can take a look at the contributions page of that IP address immediately after blocking the account. If it's the same guy and he used the same IP address while he was just logged in, then the wiki will present you the options "change block" and "unblock" instead of "block", even though you did not explicitly block that IP address yet. That's because the IP address was automatically blocked when that account was blocked.

(Nevertheless, you should still block the IP address explicitly afterwards, since the automatic block expires relatively soon.)

BTW, we also have the option to block people from posting on their own message wall. If some user is digging their own grave on their message wall after being blocked, then it might be nicer to just add this option to the block instead of prolonging the block.