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): This list has not complete. Please check this accounts. Even if Seskfabrega & other accounts not dangerous, Seskfabrega has a two warning/block: this and this, in which case Seskfabrega must blocked infinity. --Դեմ խմբակային իշխանությանը (talk) 17:12, 25 April 2015 (UTC)
Reason(s): Hi! I'm Mr. Pseudo an administrator on sq.wiki (Albanian) (link). I have given different warnings to Rrjedha and Koka11 about their harmful edits (damage in the page structure on different articles + adding not reliable sources + other linguistic deficiency problems); I have suggested them different times to make some experience before editing but I haven't seen any constructive reaction - so I temporally (2 weeks) blocked User Rrjedha (he has been blocked 2 times before, once 3 months and once 1 month, by another admin). Suddenly appears User Koka11 and starts editing. They have a very long common edit history (like this article here) and I have seen Koka11 review some edits of User Rrjedha. Seeing them alternate each other, I suspect whether the accounts are controlled by the same person. (Another administrator has my same suspicion, but since he doesn't speak, or understand English, I'm speaking for him too.). Another thing in common that makes the suspicion grow is the fact that they make the same editing errors, sometimes writing in capitalized letters, sometimes bold-ing text unnecessarily etc. I would like a response. If the check is positive that means that he is escaping the block. --Mr.PseudoDon't talk to me 18:08, 26 April 2015 (UTC)
Note: I just saw that another admin of sq.wiki has made the same request some weeks ago here. However I think you should consider my resuest independenlty of that.--Mr.PseudoDon't talk to me 18:32, 26 April 2015 (UTC)
It looks like a duck to me - If you say they behave the same way, write the same way, etc., the odds of both accounts being controlled by the same user are very high. -- M\A 18:42, 26 April 2015 (UTC)
I learn new things on wiki, everyday. Well, I should have done it before, but i just checked en:User:Rrjedha on en.wiki, and he presents himself with the name Nijazi Ramadani, that is the same name he has put on his Koka11 account on the sq.wiki. I consder it a closed issue - I now have the certainty. I didnt want to block it without beeing certain just because we are a small community... Thnx for yout time!--Mr.PseudoDon't talk to me 19:03, 26 April 2015 (UTC)
@Mr. Pseudo: We all learn new things every day :-) Feel free to come back to us if you need our assistance again. Best regards. -- M\A 19:06, 26 April 2015 (UTC)
Closed - issue resolved without the need of CU evidence. -- M\A 19:06, 26 April 2015 (UTC)