ModsFinder

Fragments Anticheat

by MC-Fragments

Fragments Anticheat checks the mods a player runs against a server whitelist before the connection is allowed to continue.

FabricClient and serverMIT License1.21.4

What it does

On a server running Fragments Anticheat, the client's mod list is compared with an allowed-mods folder that the server creates on first start. Each mod is identified by a SHA-256 hash, so a renamed or altered jar fails the check. The server also looks at which resource packs are active on the client.

Server operators can exempt chosen accounts so their own mods are not checked, and the hashes are cached at startup to keep joins quick. A timeout and error handling path covers clients that do not answer the check. The mod requires Fabric API and is distributed under the MIT License, which is not an open source designation for this project.

The mod runs on Fabric for Minecraft 1.21.4 only, in the Technology category, and its latest file is 1.9.0 for 1.21.4, published 2025-12-04. Both the client and the server must run it for the check to work.

Key features

  1. Mod verification

    Client mods are matched against the server whitelist, so unlisted mods are caught before play begins.

  2. Hash-based validation

    Each mod jar is compared by its SHA-256 hash, which detects any change to the file contents.

  3. Resource pack checks

    Active resource packs on the client are inspected as part of the join process.

  4. Operator bypass

    Server operators can run their own mods without triggering the whitelist check.

Compatibility

Latest build for each game version and loader.

1.21.41.9.0
ReleaseBetaAlphaNot available

Only full game releases are shown. This mod publishes no snapshot builds.

Requirements

Dependencies declared by the latest file for each loader.

Required 1

Fabric APILightweight and modular API providing common hooks and intercompatibility measures utilized by mods using the Fabric toolchain.
Required

How it compares

Full comparison

Different anti cheat is a server-side only Fabric mod for 1.20.1, distributed under All rights reserved and not open source. Singleplayer Anticheat is client and server, licensed under the MIT License, and covers 1.21.11 – 26.2. Vigils Anti-Cheat is server-side only under the MIT License, built for 26.2 alone.

ModLoadersGame versionsEnvironmentUpdated
Fragments AnticheatFabric1.21.4Client and server2025-12-04
Different anti cheatFabric1.20.1Server-side only2026-05-30
Singleplayer AnticheatFabric1.21.11 – 26.2Client and server2026-08-15
Vigils Anti-CheatFabric26.2Server-side only2026-08-06

Questions

Does Fragments Anticheat need Fabric API?

Yes. Fabric API is a required dependency and must be installed on the server and on each client that joins.

Does the client need the mod for the server check to work?

Yes. A server running it needs every connecting player to have it too.

Is Fragments Anticheat available for other game versions?

The mod is published for 1.21.4 only, with the Fabric loader.

In the catalog

Fragments Anticheat is one of 8,499 Technology mods on ModsFinder, and one of 4,201 Technology mods for Fabric. 17,979 mods support Minecraft 1.21.4.

Technology mods8,499Fabric modsMods for 1.21.417,979

More from MC-Fragments

All projects
Project: Fragments1.21.1 – 1.21.4Fragments Combat Mod1.21.4

Similar mods

GD656Killicon1.18.2 – 1.21.4CC: Tweaked1.4.7 – 26.3ImmersiveThunder1.19.3 – 1.21.6Applied Energistics 2 Wireless Terminals1.16.5 – 26.3Moving Elevators1.12 – 26.3Camerapture1.20 – 26.3

What the author says

A server-side anti-cheat system for Fabric that ensures all players are using only allowed mods with correct versions. When you join the server, your installed mods are automatically checked. If you are using unauthorized or modified mods, you will be kicked with a list of problematic mods.
MC-Fragments, on the Modrinth page

Official listing

Owner
MC-Fragments
Published
2025-11-18
Updated on Modrinth
2025-12-04
Facts verified
2026-10-15

Tags

Game mechanicsTechnology
Open on ModrinthCompare