ClientBlock

ClientBlock

Filter and list Minecraft clients/brands at server side, block or allow them. Fabric Mod.

by
1.2K Downloads
fabricmanagement
Rent Server with this 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

ClientBlock-v0.1.6release
MC 1.21, 1.21.1, 1.21.2, 1.21.3, 1.21.4, 1.21.5, 1.21.6, 1.21.7, 1.21.8, 1.21.9, 1.21.10, 1.21.11fabric
December 14, 2025
ClientBlock-v0.1.5release
MC 1.21, 1.21.1, 1.21.2, 1.21.3, 1.21.4, 1.21.5, 1.21.6fabric
June 19, 2025
ClientBlock-v0.1.4release
MC 1.21, 1.21.1, 1.21.2, 1.21.3, 1.21.4, 1.21.5fabric
April 11, 2025
ClientBlock-v0.1.3release
MC 1.21, 1.21.1, 1.21.2, 1.21.3, 1.21.4fabric
March 20, 2025
ClientBlock-v0.1.2release
MC 1.21, 1.21.1, 1.21.2, 1.21.3, 1.21.4fabric
December 27, 2024

How to Install ClientBlock on Your Server

1

Order Server

Order a Minecraft Java server with at least 3 GB RAM (4 GB recommended).

2

Set fabric Loader

In the panel under "Egg", select the fabric loader and matching Minecraft version (1.21.11).

3

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

fabric

Minecraft Versions

1.21.11, 1.21.10, 1.21.9 (+9 more)

Server-side

Required

Recommended 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.

Rent Modded Server

Install ClientBlock with just one click on your server.

Recommended RAM
4 GBab €8/mo
Min. 3 GB | +1 GB pro 8 Spieler
Create Server Now
1-Click Mod Install
NVMe SSD Storage
DDoS Protection included

Details

License
MIT License
Server-side
Required

Supported Versions

1.21.111.21.101.21.91.21.81.21.71.21.61.21.51.21.41.21.31.21.2+2 more