How does Wikipedia handle the attribution of edits when a user changes their username or contributes from an IP address?

Wikipedia keeps a record of who made every edit. In page history, each revision shows a username, a temporary account name, or, for older edits, the IP address [26]. So the answer splits into two parts: what happens for named usernames, and what happens for IP-based contributions.

Username changes: past edits follow the new name

• You can request a username change and have past contributions re-attributed to the new name [1].
• After the change, the new name is what shows up in page histories, diffs, logs, and user contributions [2].
• Wikipedia points users to Wikipedia:Changing username when someone wants all their old edits credited to a new name [5][15][24][34].
• One exception: signatures on discussion pages are not automatically updated. They keep the old name unless edited manually, and manual updating is not recommended except for privacy reasons [3].
• For global renames across Wikimedia wikis, the old name is kept visibly linked to the new name on wikis where the user is active or has a history of conflict or blocks [36].
• If the target username already existed, the ordinary name-change script did not work, and a developer had to figure out another way [31].

A confusing note: an archived page called "Changing attribution for an edit" says that as of 2005, edits are no longer reattributed [7][9][12][21][33][37]. That page covers an older, separate process of manually changing the attribution shown for an individual past edit. The normal username-change route is different and still reattributes contributions to the new name [1][2].

IP-address edits: what changed over time

In the past, editing without an account publicly displayed your IP address [18]. That could be less anonymous than editing with a normal account [17]. Administrators could usually identify the IP address of someone editing articles, track it to a rough location, and use behavioral patterns—similar usernames, focus on certain topics, similarities between accounts—to connect multiple accounts to one person [19][20].

Since November 2025, Wikipedia no longer uses IP addresses for new unregistered edits. Instead, unregistered users get a temporary account, created automatically when they publish an edit [4][14][25][35][43]. Older edits in page history can still show an IP address [26].

Moving from IP editing to a registered account

If you edit as an IP and later create a username, the old IP edits are not merged into your new username. They stay attributed to the IP address [8][10][13][32][40]. Wikipedia suggests workarounds instead:

• If you have a static IP that will not be reused, you can redirect your anonymous User and User Talk pages to your new account [23][39].
• You can post a list of your contributions on your new user page [22][38].
• You can add a note on your new User and User Talk pages explaining the change [8].

These workarounds do not rewrite history. Anyone investigating the old edits may be redirected to your new name, but the old edits still show the IP [10][13][32][40].

Historical reattribution of IP edits

Long ago, a developer could alter the database so an edit attributed to an anonymous IP became attributed to a username [6][16][41]. This was meant for people who could prove authorship or prove their identity by technical means [11][30]. Old discussions show the safety concerns: reviewers proposed requiring confirmation from both a logged-in and a logged-out session and keeping a log, so anonymous users could not attach controversial comments to innocent registered users [28]. Example requests exist, such as "change edit by ip 76.175.34.178 to user wedgecon" [27], and developers sometimes ran direct SQL updates to make the change [29].

This service ended. The archived page says that as of 2005, edits are no longer reattributed [7][9][12][21][33][37].

Accidentally edited while logged out?

If you accidentally make an edit while logged out, there is a self-service fix: while still logged out, revert to the version in the history immediately before your edit; then log in and reapply the edit, re-entering your original edit summary [42]. This gets the article into the state you wanted under your username, but it is a workaround, not a rewrite of the old history [42].