ModsJava
MC×Authentication
I don't know my version or loader
Open the Minecraft launcher and look at the profile you play on — it names both, like fabric-loader-1.21.4. The version also shows in the bottom-right corner of the game's main menu.
No loader in the profile name? Then it's plain Minecraft, and these mods won't run — you need Fabric or NeoForge installed first.
MC×Authentication is a simple plugin, made for authenticating users in offline servers. It also automatically authenticates registered players playing on an Official Minecraft copy, provided they pass an automated security check.
Security Check When logging in, the plugin automatically logs the user's IP adress into the Database. Should the last known IP adress differ from the current one, the user is asked to enter their password.Quick facts
- Edition: Minecraft Java
- File type: .jar
- Minecraft versions listed: 1.21, 1.21.1, 1.21.2
- How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
- Where to get it: Opens on Modrinth — not every file is mirrored on our own servers.
Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.
Verified by MCModsHub
- Ships as MCxAuthentication-2.0.jar — drop this file into the mods folder
- Download size: 31 KB
- Download link checked 7 Sept 2026 — working
These come from our own check of the pack file, not from the source page.