Zeffut Mod Checker
Reports a player's installed mods to the server so admins can allow or ban mods and kick anyone using a banned one, with a handshake so the client only talks to a ModChecker server.
About this Mod
ModChecker
ModChecker reports each player's installed mods to the server. Admins can mark mods as
allowed or banned, and players carrying a banned mod are kicked.
How it works
A handshake keeps it clean: when you join, the server announces itself (modchecker:hello),
and only then does the client send its mod list (modchecker:modlist). A vanilla client
ignores the announcement, and the client never reveals its mod list to a server that doesn't
run ModChecker.
Features
- Client mod for Fabric and NeoForge
- Minecraft 1.21.11, 26.1, 26.1.1, 26.1.2
- Server side as a Paper/Purpur plugin and a Velocity proxy plugin (enforcement at the proxy)
/modsadmin GUI and commands: list, inspect a player, allow / ban / reset a mod- Configurable kick messages, optional "kick players without the mod", permission bypass
Server side
Install the matching server plugin to manage and enforce the mod list.
Available Versions
How to Install Zeffut Mod Checker on Your Server
Order Server
Order a Minecraft Java server with at least 3 GB RAM (4 GB recommended).
Set fabric Loader
In the panel under "Egg", select the fabric loader and matching Minecraft version (26.1.2).
Install Mod
Open the mod browser in the dashboard and search for "Zeffut Mod Checker". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.
Compatibility
Mod Loaders
Minecraft Versions
26.1.2, 26.1.1, 26.1 (+1 more)
Server-side
✗ UnsupportedRecommended RAM
4 GB(min. 3 GB)Frequently Asked Questions
Zeffut Mod Checker server crashes on startup – what to do?
Most common cause: wrong fabric version or insufficient RAM. Check the server log (latest.log) for "OutOfMemoryError" or "Mixin" errors. With Mado Hosting: ensure at least 3 GB RAM is allocated and the loader matches the mod version (26.1.2). You can switch loaders with one click in the panel.
Is Zeffut Mod Checker compatible with fabric and neoforge?
Zeffut Mod Checker officially supports fabric, neoforge for Minecraft 26.1.2, 26.1.1, 26.1. The Mado dashboard automatically detects incompatible loader combinations.
Server lagging with Zeffut Mod Checker – how to optimize performance?
Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if Zeffut Mod Checker consumes the most tick time. Common fixes: reduce server view-distance to 8-10, install "performant" or "starlight" as supplementary mods on Forge. With Mado Hosting, your server runs on NVMe SSDs with dedicated CPU cores for minimal latency.
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Rent Modded Server
Install Zeffut Mod Checker with just one click on your server.