Rede Nerd DeviceGuard

English

Device-based moderation for Minecraft 1.21.1 — NeoForge and Java 21.

Rede Nerd DeviceGuard helps server administrators detect ban evasion by associating Minecraft accounts with pseudonymous device identifiers. A device ban can remain effective when a player changes accounts or IP addresses, provided the device fingerprint remains the same.

Features

• Device bans: ban a known device and disconnect players using it.

• Offline moderation: ban previously identified players by their stored name or UUID.

• Ban list: view active device bans with associated players, Device IDs, reasons, administrators, and dates.

• Account history: inspect accounts associated with a device and devices associated with an account.

• Player consent: a notice appears before device identification is sent.

• Singleplayer exemption: no verification or consent prompt for the owner of a singleplayer world.

• Local storage: server records are stored in SQLite.

• Cryptographic authentication: Ed25519 challenge-response signatures and server-specific HMAC Device IDs.

Installation

Install the same mod JAR on both the client and server.

Requires:

• Minecraft 1.21.1

• NeoForge 21.1.249

• Java 21

By default, the server requires connecting players to have DeviceGuard installed. Remote players joining a LAN world are also subject to verification.

Administrative commands

Commands require operator level 3 or server console access.

Command Description /devicebanlist [page] List active device bans and associated players /deviceinfo <player> View the player’s most recent device and associated accounts /deviceban <player> <reason> Ban the player’s most recent known device, including while offline /devicebanid <deviceId> <reason> Ban a device directly /deviceunban <deviceId> Remove a device ban /deviceaccounts <player> List accounts associated with the player’s most recent device /devices <player> List known devices associated with an account