PolskieLobbyAC Mod
by korex-x
PolskieLobbyAC Mod is the client half of the PolskieLobbyAC anti-cheat system, an official verification mod for Fabric that runs in the background when a player joins a server.
What it does
When the client connects to a server that runs the PolskieLobbyAC Server Plugin, the mod carries out a secure Handshake in the background. The server uses that verification to decide whether a connection is allowed, and it rejects unauthorized clients. Players install the mod by dropping it into the mods folder of a Fabric client and then joining the server.
The mod is described by its author as extremely lightweight and as needing no configuration. It is client-side only, so a server does not need it for the verification itself, but the protection depends on the dedicated encrypted PolskieLobbyAC Server Plugin. That plugin is what blocks movement hacks and auto-clickers on the server side. The mod is published for 1.21.11 only, with version 1.2.1 as the latest Fabric file from 2026-05-02.
Source code and an issue tracker are publicly available. The license is GNU General Public License v3.0 only, and a Polish version of the description is included below the English one in the author text.
Key features
Background Handshake
The mod performs a secure Handshake with the server in the background, without a visible step for the player.
Server connection checks
A server running the matching plugin can reject unauthorized connections, based on the verification the client sends.
Low resource use
The author describes the mod as extremely lightweight and says it needs no configuration after installation.
Movement and auto-clicker blocking
Paired with the server plugin, the system targets movement hacks and auto-clickers, which the author names as the cheats it addresses.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Protecting a server
Server owners who run the PolskieLobbyAC Server Plugin can require the client mod so that unverified connections are refused.
Who it’s for: The mod suits server owners who want an anti-cheat check on connecting players, and players on those servers who need the client-side part installed.
Questions
Does PolskieLobbyAC Mod need a server-side install?
Which Minecraft version does the mod support?
Is the source code available?
In the catalog
PolskieLobbyAC Mod is one of 8,499 Technology mods on ModsFinder, and one of 4,201 Technology mods for Fabric. 19,862 mods support Minecraft 1.21.11.
Similar mods
What the author says
Welcome! This mod is the official client-side verification system for the PolskieLobbyAC. The mod automatically performs a secure Handshake in the background. It is extremely lightweight, does not drain system resources, causes zero FPS drops, and requires absolutely no configuration from you.
Official listing
- Modrinth page
- modrinth.com/mod/polskielobbyac
- Owner
- korex-x
- Published
- 2026-04-18
- Updated on Modrinth
- 2026-05-02
- Facts verified
- 2026-10-15