WhoAmI
by Calyren
WhoAmI changes how a server assigns player identities when online mode is switched off, so offline-mode servers can keep real account UUIDs.
What it does
On a server running with online_mode set to false, a player joining normally receives a random offline UUID that does not match their Mojang account. WhoAmI checks Mojang's API for the account name, finds the real UUID and assigns it instead. The result is that inventories, permissions and other per-player data stay attached to the same player after a switch in either direction.
Only the server needs the mod: players join without installing anything, and the environment is server-side only. Files are published for Fabric 1.20.1 and NeoForge 1.21.1, under the MIT License, and the project is open source with public source code and an issue tracker.
Key features
Real UUID lookup
Joining players are checked against Mojang's API so their account UUID is found by name.
Offline UUID fallback
When no account matches, a random offline UUID is assigned as usual, so unlicensed joins still work.
Per-player data retention
Player data keyed by UUID remains tied to the same person on servers that run without online mode.
Tested compatibility
The author lists the mods tested alongside WhoAmI, including Arsenal Essential Mod and ForceTablistHeads.
Gallery
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Offline-mode survival servers
A server that disables online mode to allow unlicensed clients can keep each player's UUID and saved progress.
Switching online mode
Owners who move a server between online and offline mode can avoid losing player data tied to the UUID.
Who it’s for: Server owners running online_mode false who want player UUIDs resolved from Mojang accounts. Players on the client side do not need the mod.
How it compares
Selective Offline Mode is a Fabric server-side mod under the MIT License, covering 1.20 – 1.21.5, and it is open source. UUID Off is also server-side and Fabric-only, for 1.20.2 – 1.20.4, but it is under All rights reserved and is not open source. Connecto is server-side on Fabric for 1.20.2 – 26.2 under the MIT License, and it is open source.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| WhoAmI | Fabric and NeoForge | 1.20.1 – 1.21.1 | Server-side only | 2026-07-17 |
| Selective Offline Mode | Fabric | 1.20 – 1.21.5 | Server-side only | 2025-06-01 |
| UUID Off | Fabric | 1.20.2 – 1.20.4 | Server-side only | 2024-05-15 |
| Connecto | Fabric | 1.20.2 – 26.2 | Server-side only | 2026-08-12 |
Questions
Does WhoAmI need to be installed on clients?
Which loaders and versions does WhoAmI support?
Does WhoAmI require any other mod?
In the catalog
WhoAmI is one of 5,392 Social mods on ModsFinder, and one of 4,084 Social mods for Fabric. 32,366 mods support Minecraft 1.21.1.
More from Calyren
Similar mods
What the author says
Resolves UUID issues on offline mode Servers. Q: Will WhoAmI make mod x work? A: I've already listed the mods that were tested with it.
Official listing
- Modrinth page
- modrinth.com/mod/who-am-i
- Owner
- Calyren
- Published
- 2026-03-07
- Updated on Modrinth
- 2026-07-17
- Facts verified
- 2026-10-15