Extension:CheckUser


 * This page is about the extension. You may be looking for Wikimedia's CheckUser policy, which is located on Meta-Wiki.

CheckUser is an extension that allows a user (with checkuser permission) to check which IPs are used by a given username and which usernames are used by a given IP, without having to run queries directly against the database by hand. The extension is running live on all Wikimedia wikis.

The original extension for checking registered users IPs was called Espionage (previously Userip) and it was written by Ævar Arnfjörð Bjarmason in 2005.

Getting registered users' IPs

 * 1) Go to Special:CheckUser.
 * 2) Enter the username in the "user" box.
 * 3) Enter the reason for CheckUsering in the "reason" box.
 * 4) Press "Get IPs".

Getting edits by an IP or accounts

 * 1) Go to Special:CheckUser.
 * 2) Enter the IP address on the "IP" box.
 * 3) Enter the reason for CheckUsering in the "reason" box.
 * 4) Press "Get edits" or "Get users."

Logs
A log of all CheckUser checks is maintained and it can be viewed in Special:CheckUser page by those whom have CheckUser rights. The log usually needs to be disabled or the directory ($wgCheckUserLog) for log outputs set to valid directory on non-Wikimedia wikis in order for the extension to correctly work.

Predecessor of CheckUser
CheckUser was preceded by a tool called Espionage (previously Userip). It was written by Ævar Arnfjörð Bjarmason in 2005. Since it was replaced by CheckUser, it isn't recommended to use Espionage, but if you can't use CheckUser, you can download Espionage from Subversion.

Licensing and downloads
The extension is available under the GNU General Public License 2.0 or later, and can be downloaded from Subversion, or accessed via the web-based viewer.

The software is provided as-is. Updates will be made according to the needs of Wikimedia wikis; or where critical vulnerabilities are discovered.