CheckUser policy: Difference between revisions

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This page provides information about CheckUser access and outlines the policy on its use. It was discussed in September and October 2005, and went live in November 2005.

Other languages : Template:CheckUserPolicyLang

CheckUser status

CheckUser is a special interface for users with the checkuser permission. An editor with CheckUser status on a wiki can in particular check if a user isn't a sockpuppet of another user on that wiki (not on all wikis). By using it, users are able to:

Determine from which IPs a user has edited the Wikimedia wiki
Determine the edits on the Wikimedia wiki of a specific IP (even when logged in)

This information is only stored for a short period, so edits made prior to that will not be shown via CheckUser. A log is kept of who has made which queries with the tool. This log is available to those with the checkuser permission:

5 sep 2006 17:29 UserX got IPs for UserY on zzwiki
5 sep 2006 17:29 UserX got edits for 127.0.0.1 on zzwiki

See Help:CheckUser for the user manual.

Wikimedia privacy policy

On Wikimedia projects, privacy policy considerations are of tremendous importance. Unless someone is definitely violating policy with their actions (e.g. massive bot vandalism or spam), revealing their IP, whereabouts or other information sufficient to identify them is likely a violation.

CheckUser requires the level of confidentiality one would apply to our most confidential user data.

The relevant section of the privacy policy is:

Policy on release of data derived from page logs

It is the policy of Wikimedia that personally identifiable data collected in the server logs, or through records in the database via the CheckUser feature, may be released by the system administrators or users with CheckUser access, in the following situations:

In response to a valid subpoena or other compulsory request from law enforcement
With permission of the affected user
To the chair of Wikimedia Foundation, his legal counsel, or his designee, when necessary for investigation of abuse complaints.
Where the information pertains to page views generated by a spider or bot and its dissemination is necessary to illustrate or resolve technical issues.
Where the user has been vandalising articles or persistently behaving in a disruptive way, data may be released to assist in the targeting of IP blocks, or to assist in the formulation of a complaint to relevant Internet Service Providers
Where it is reasonably necessary to protect the rights, property or safety of the Wikimedia Foundation, its users or the public.

Wikimedia policy does not permit public distribution of such information under any circumstances, except as described above.

Information release

Even if the user is committing abuse, it's best not to reveal personal information if possible.

Generally, do not reveal IPs. Only give information such as same network/not same network or similar. If detailed information is provided, make sure the person you are giving it to is a trusted person and will not reveal it himself.
If the user has said they're from somewhere and the IP confirms it, it's not releasing private information to confirm it if needed.
If they're on a large national or international ISP (e.g. AOL, NTL, BT, Telstra) where they're one of millions of users, saying so is unlikely to be personally identifiable.
Revealing the country is generally not personally identifiable (e.g. "User:Querulous is coming in from the UK, User:Sockpuppet is coming in from Canada").
If you're in any doubt, give no detail.

Use of the tool

The tool is to be used to fight vandalism or check abuse of sockpuppets, for example when there is a suspicion of illegal voting. It must be used only to prevent damage to one or several of Wikimedia projects.

One is not allowed to use the tool for political control, nor to apply pressure on editors, nor as a threat toward an editor with whom you are in disagreement. There must be a valid motive to check a user (a bare disagreement with the leaders of a wiki is not a valid motive).

It is allowed to check an editor's IPs upon his specific request, when this user wants to publicly prove his innocence. Note that the tool may provide some partial evidence for him, while it does not prove his innocence by itself.

As a reminder, sockpuppets are not generally forbidden (editors may edit wikipedia under several accounts). It is the abuse of sockpuppets use (and in particular voting twice under two different names) which is severely frowned upon.

Notification to the one checked is not mandatory, but checkuser may choose to tell the person checked if they feel it best. Similarly, notification of the check to the community is not mandatory, but may be done as long as private information is not released.

Access

Only a very few editors and Stewards are allowed to have the CheckUser status. Editors will only have CheckUser status locally.

On a wiki with a (Wikimedia-approved) Arbitration Committee, only editors approved by the Arbitrators may have CheckUser status. There should be at least two so that they can mutually control their activity. After agreement, simply list the candidate on Requests for permissions.

On a wiki with no Arbitration Committee, two options are possible:

The community must approve at least two CheckUsers per consensus. Activity will be checked mutually. The user requesting check user status must request it within his local community and advertise this request properly (village pump, mailing list when available, ...). The editor must be familiar with the privacy policy. After gaining consensus (70%-80%) in his local community, with at least 25-30 editors' approval, the user should list himself under Requests for permissions with a link to the page with the community's decision.

If an insufficient number of voters do not allow to vote for two checkusers on a wiki, there will be no checkuser on that wiki. Editors will have to ask a Steward to check if UserX is a sockpuppet of UserY. To do so, simply add your request to Requests for CheckUser information listing these users and explaining why you ask for such a check (with links). You also need a community consensus (like above). The Steward will answer you if these two users are from the same IP, same proxy, same network, same country, or are they completely unrelated (see discussion for what the Steward should more precisely say to the editor).

Mailing list

For Wikimedia checkers, there is a mailing list, checkuser-l. This is a closed list. Use this list to ask for help, ideas and second opinions if you're not sure what the data means.

Removal of access

Any user account with checkuser status that is inactive for more than a year will see their checkuser access be removed.

In case of abusive use of the tool, the Steward or the editor with the CheckUser privilege will immediately have their access removed. This will in particular happen if checks are done routinely on editors without a serious motive to do so (links and proofs of bad behavior should be provided).

Suspicion of abuses of checkuser should be discussed on each local wiki. On wikis with an arbcom, the arbcom can decide on the removal of access. On wikis without arbcom, the community can vote removal of access. Removal can be done by Stewards. The Stewards may not decide alone of removal, but can help provide the information necessary to prove the abuse (log). If necessary, and in particular in case of lack of respect towards the privacy policy, the board of Wikimedia Foundation can be asked to declare removal of access as well.

In case only one checkuser is left on a wiki, the community should elect a new checkuser (so that the number of checkusers is at least two).

Current users with access

Edit (last updated: 2026-08-17)

Everywhere

Stewards – upon request or their own initiative, stewards use it by briefly granting the right to themselves; this is logged (see global group)
Some Staff members of the Wikimedia Foundation (see global group)
Members of the Ombuds commission (see global group):
1. Ameisenigel
2. Arcticocean
3. Chinmayee Mishra
4. Faendalimas
5. Jnanaranjan sahu
6. Mehman
7. MrJaroslavik
8. Nehaoua
9. Revi C.
10. RoySmith
11. Teles
12. Zafer
Members of the Universal Code of Conduct/Coordinating Committee (see global group) have the technical ability to view the checkuser log:
1. Barkeep49
2. Borschts
3. BRPever
4. Civvì
5. EggRoll97
6. EPIC
7. Ferien
8. Ghilt
9. Luke081515
10. Superzerocool
11. Toadspike
12. ToprakM
13. Torque
14. 기나ㅏㄴ (ginaan)

82.43.244.187 (talk)

Revision as of 13:17, 17 March 2007

CheckUser status

Wikimedia privacy policy

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Mailing list

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