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.
Reason(s): As Mogoeilor was the driving force behind lrcwiki, which had to be closed because it was not really written in lrc, but in a self-invented form of the language - and the same applies for Wp/luz and Wp/bqi on Incubator - I strongly suspect that he was using sockpuppets and ask for a check. --MF-W 14:11, 15 January 2021 (UTC)
Reason(s): The edit behavior of User:呼尔奇兰 is similar to User:IN (i.e recorded own edit count) and LTA PXD (created the article soon after start editing and submitted the article to zh:WP:新条目推荐/候选). So CU request is needed for verify their relationships. The third and forth account were confirmed that they were sockpuppets of PXD. Thank you. --SCP-2000 13:21, 17 January 2021 (UTC)