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): There have been several discussions in Persian Wikipedia that whether this user is a sock or meat of Diako1971 who has an ongoing RfA. As a local 'crat I would like to know that :) Thank you Amir (talk) 11:29, 25 April 2016 (UTC)
Results are Inconclusive and show no overlapping IP. Besides, technical information obtained is not exactly consistent with standard updating of software over time. Anyway, behavioral evidence is key in determining either sock or meat puppetry. RadiX∞ 13:03, 25 April 2016 (UTC)
Reason(s): More nicks: "Wszyscy mamy IP 194 149 88 126", "Ja też mam IP 194 149 88 126", "Moje IP to 194 149 88 126". I'd like to request a CU against these users and the IP address 22.214.171.124. On the next day it was blocked, new accounts started to show up and follow the same edit pattern. Sometimes a block was closely followed by another account creation. Nicknames from "Początkujący użytkownik" onwards have been already confirmed by a steward, I'm putting them here so a full history of this case is kept. There was a suspicion that some of these users correspond to plwikt's LTA Wikinger, see this edit. The next step I'd like to consider is blocking that IP with the "Prevent account creation" option enabled. Regards, Peter Bowman (talk) 21:26, 25 April 2016 (UTC)
Hi, apologies for the slowness in actioning your request. I'll take a look at this later today if nobody else gets to it by then. Ajraddatz (talk) 14:38, 28 April 2016 (UTC)
Reason(s): Similar behaviour and similar user names. Edit pattern is also similar to recently identified sockpuppet accounts (see BLÆGG@no.wikipedia). - 4ing (talk) 13:43, 28 April 2016 (UTC)
All Confirmed, same person as that last request. no:Spesial:Bidrag/CamillaPå is the only unblocked account of this pattern that I can see in the results. All accounts are using a mess of IPs, especially mobile ranges which are shared with many active and obviously good-faith users. I could provide a list of all accounts with my own judgements of likely or unlikely for you to sort through, if you'd like to see which ones match the pattern. Ajraddatz (talk) 14:34, 28 April 2016 (UTC)
Thanks for your quick response. I think we'll leave it with that for now, the main outcome of the CU is the connection to the previous case (which again is connected to the Mynas case). - 4ing (talk) 07:02, 29 April 2016 (UTC)
Reason(s): I want to felt become a checkuser in here. I'm trusted, I'm can't shared a any info. You can check myuser before you give me a checkuser Murbaut (talk) 07:03, 1 May 2016 (UTC)
This is not the place for asking for permission. And I can't see that you meet the criteria, so even if the request was places at Steward requests/Permissions it would probably be closed as "Not done". -- Tegel(Talk) 09:04, 1 May 2016 (UTC)