
ClientBlock
Filter and list Minecraft clients/brands at server side, block or allow them. Fabric Mod.
About this Mod
ClientBlock
A Fabric Mod for blocking/filtering Minecraft clients (JUST SERVER SIDE!).
Configuration
The configuration file is created automatically inside your Fabric Mods
configurations folder. The file is named clientblock.json which has
this structure:
{
// Json schema for having types in config
"$schema": "https://raw.githubusercontent.com/arch-fan/ClientBlock/refs/heads/main/config.schema.json",
"action": "block", // "block" or "allow" (block by default)
"clients": [
"fabric"
], // Array of clients to block or allow (based in action mode) (empty by default)
"kickMessage": "Custom kick message", // The client is not allowed! ("The client is not allowed!" by default)
"logger": false, // Where to log every single person client entering at the server (false by default)
"whitelist": [
"PlayerOne"
] // Array of players to bypass the client filter (empty by default)
}
Here you can copy the template without comments :)
{
"$schema": "https://raw.githubusercontent.com/arch-fan/ClientBlock/refs/heads/main/config.schema.json",
"action": "block",
"clients": [
"fabric"
],
"kickMessage": "Custom kick message",
"logger": false,
"whitelist": [
"PlayerOne"
]
}
Commands
/clients for listing all clients.
Publication
Actually, the mod is published in two mod providers
Available Versions
How to Install ClientBlock 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 (1.21.11).
Install Mod
Open the mod browser in the dashboard and search for "ClientBlock". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.
Compatibility
Mod Loaders
Minecraft Versions
1.21.11, 1.21.10, 1.21.9 (+9 more)
Server-side
✓ RequiredRecommended RAM
4 GB(min. 3 GB)Frequently Asked Questions
ClientBlock 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 (1.21.11). You can switch loaders with one click in the panel.
Is ClientBlock compatible with fabric?
ClientBlock officially supports fabric for Minecraft 1.21.11, 1.21.10, 1.21.9. The Mado dashboard automatically detects incompatible loader combinations.
Server lagging with ClientBlock – how to optimize performance?
Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if ClientBlock 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 ClientBlock with just one click on your server.