Make sure you have a good reason for the check. It will only be accepted to counter vandalism or disruption to Wikimedia wikis. Valid reasons include needing a block of the underlying IP or IP range, disruptive sockpuppetry, vote-stacking, and similar disruption where the technical evidence from running a check would prevent or reduce further disruption.
Be specific in your reasons. Ambiguous or insufficient reasons will cause delays. Explain the disruption and why you believe the accounts are related, ideally using diff links or other evidence.
Make sure there are no local checkusers or policies.
Reason(s): bg:User:Mpb eu had now been indefinitely banned due to harnessing, editing thought proxies and manipulating votes. After he was banned a couple of more accounts with similar edit pattern have popped-up after the previous request, again trying to vote in deletion requests even thought the policy states that new users cannot vote. Because these might be meatpuppets rather than Mpb_eu himself can you please check if there is any relation between the accounts?--The Wiki Boy (talk) 09:41, 10 September 2016 (UTC)
Doing... Will see what we can find. --Jyothis (talk) 22:55, 13 September 2016 (UTC)