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)
Reason(s): User Νεοκλής και Νικοκλής is clearly not a new user, learning immediately how to go to recent changes and change speedy deletion requests and templates and shows a tendency to edit mass media and politics related articles. It is strongly suspected to be a sock puppet of a blocked user. C messier (talk) 16:46, 16 September 2016 (UTC)
Done. user: Η Θάνου της Βικιπαίδειας is Likely. I can see that user:Νεοκλής και Νικοκλής is, according to CU data, the same user as blocked: Ο ΣΕ ΘΕΛΩ ΕΙΝΑΙ ΤΕΛΙΟΣ, + Α Γ Υ Ρ Τ Η Σ +, Νικόλας Παπετοστόλου. There are also two more accounts, not blocked, but not used since August: Στέλιος Θ. and Βενιαμίν Ζερβάκης. Please compare their edit pattern, etc. I cannot see connection between the rest of accounts you listed. einsbortalk 23:01, 16 September 2016 (UTC)
Reason(s): Edit pattern raises the strong suspicion that Darcolit may be a recent sockpuppet of w:ro:Utilizator:BAICAN XXX, banned project-wide, who maintains a very prolific clone farm. The other names are recent sockpuppets, confirmed and blocked three days ago; they are mentioned here to assist in the search. If confirmed, I would like to block the range 2003:68:ec00::/40; this has been done twice before and it helped. Would that be appropriate? This guy is giving us a lot of trouble. -- Victor Blacus (talk) 15:32, 18 September 2016 (UTC)
Confirmed. You can also block that range as there are no other users on it. Ruslik (talk) 16:28, 19 September 2016 (UTC)
Blocks is necessary (for en.wikipedia and fa.wikipedia)...Thank you :)--Iran9 (talk) 06:33, 23 September 2016 (UTC)
Comment first: User:Derakhshan has already announced that آتروپات & بهمنیار are both his alternative accounts. second: We have a local CU in FaWiki and third: User:Iran9 has been blocked indef for Sock puppetry (See the list of his socks).--ArianTalk 20:10, 23 September 2016 (UTC)
We won't undertake this request. FA and EN has local CUs. Please don't change the status of this request. —MarcoAurelio 10:58, 24 September 2016 (UTC)
no problem.@Mardetanha: (Steward persian) come here fa: با اطیمنان میگویم درخشان 80تا زاپاس دارد. مردتنها اگر مردی به اینجا میآیی و درخواست بازرسی میدهی هرچند ان قدر رفتار منفعل بودن در مقابل خودی ها و غیرخودیها را دیدم که به شما هم شک دارم. سپاس--Iran9 (talk) 11:08, 24 September 2016 (UTC)