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Anti-DupeMinecraft plugin for 1.21.11

A security tool for Minecraft servers, designed to prevent item duplication exploits.

server onlynewest supported 1.21.11TechnologyUtilityEconomyGame Mechanics
Latest version
3.0
Minecraft
1.21 to 1.21.11
Java
Java 21+
Platforms
Bukkit, Spigot, Purpur, Paper
Licence
LicenseRef-All-Rights-Reserved
Downloads
26.5k
Updated
4 d ago
Available on
Modrinth
Space NodeOur hosting

Host Anti-Dupe servers

One click and Anti-Dupe is installed on a Paper or Purpur server built for it.

  • 1.21.11
  • Bukkit
  • Spigot
  • Purpur
  • Paper
  • One click plugin install
  • Paper and Purpur ready
  • Automatic updates
  • NVMe SSD
Deploy a serverFrom €0.90 per GB

Screenshots

Click a screenshot to open it. Screenshots are served from the author’s own host and belong to them.

Minecraft versions

Every version Anti-Dupe declares support for, newest first, with the Java runtime that version needs.

Other plugins
MinecraftThroughJavaEvidenceReleased
1.21.11Bukkit, Spigot, Purpur, Paper21+declared9 Dec 2025
1.21.10Paper, Spigot, Purpur, Bukkit21+declared7 Oct 2025
1.21.9Paper, Spigot, Purpur, Bukkit21+declared30 Sept 2025
1.21.8Paper, Spigot, Purpur, Bukkit21+declared17 Jul 2025
1.21.7Paper, Spigot, Purpur, Bukkit21+declared30 Jun 2025
1.21.6Bukkit, Paper, Purpur, Spigot21+declared17 Jun 2025
1.21.5Bukkit, Spigot, Purpur, Paper21+declared25 Mar 2025
1.21.4Paper, Spigot, Purpur, Bukkit21+declared3 Dec 2024
1.21.3Bukkit, Spigot, Purpur, Paper21+declared23 Oct 2024
1.21.2Bukkit, Spigot, Purpur, Paper21+declared22 Oct 2024
1.21.1Paper, Spigot, Purpur, Bukkit21+declared8 Aug 2024
1.21Spigot, Paper, Purpur, Bukkit21+declared13 Jun 2024

Download

From Anti-Dupe’s own host. Nothing is re-hosted here.

3.0release3 Feb 2026

BlockSigningPlugin-3.0.jar · 0.9 MB · for 1.21, 1.21.1, 1.21.2, 1.21.3, 1.21.4 +7 more

Download latest
701d54c87ac0…
Older versions17
  • 2.925 Jan 20261.21.110.9 MB496 downloadsf921a4a27bf3…Get
  • 2.820 Jan 20261.21.110.8 MB301 downloads8ba79884494a…Get
  • 2.718 Jan 20261.21.110.8 MB130 downloads521a7cbb1f29…Get
  • 2.69 Jan 20261.21.110.8 MB634 downloads5d4024fd68c5…Get
  • 2.57 Jan 20261.21, 1.21.1, 1.21.2, 1.21.3, 1.21.4 +7 more0.8 MB724 downloads40dcb09432b7…Get
  • 2.46 Jan 20261.21, 1.21.1, 1.21.2, 1.21.3, 1.21.4 +7 more0.1 MB102 downloads4c0cd3075b8d…Get
  • 2.31 Nov 20251.21, 1.21.1, 1.21.2, 1.21.3, 1.21.4 +7 more0.1 MB3.5k downloads993499865128…Get
  • 2.225 Oct 20251.21, 1.21.1, 1.21.2, 1.21.3, 1.21.4 +6 more0.1 MB453 downloadsdc34cf334a55…Get
  • 2.116 Sept 20251.21, 1.21.1, 1.21.2, 1.21.3, 1.21.4 +5 more0.1 MB470 downloads951851604651…Get
  • 2.029 Aug 20251.21, 1.21.1, 1.21.2, 1.21.3, 1.21.4 +4 more0.1 MB169 downloads0f1b10509fc5…Get
  • 1.925 Aug 20251.21, 1.21.1, 1.21.2, 1.21.3, 1.21.4 +4 more0.0 MB136 downloads90ceb2d76160…Get
  • 1.819 Aug 20251.21, 1.21.1, 1.21.2, 1.21.3, 1.21.4 +4 more34.9 MB265 downloads1c050f9a0b8a…Get
  • 1.718 Aug 20251.21, 1.21.1, 1.21.2, 1.21.3, 1.21.4 +4 more34.9 MB65 downloads608340a38580…Get
  • 1.611 Aug 20251.21, 1.21.1, 1.21.2, 1.21.3, 1.21.4 +4 more34.9 MB288 downloadse62836febbc9…Get
  • 1.57 Jul 20251.21, 1.21.1, 1.21.2, 1.21.3, 1.21.4 +4 more34.9 MB1.1k downloadsaee0071c96a2…Get
  • 1.423 Mar 20251.21, 1.21.1, 1.21.2, 1.21.3, 1.21.4 +3 more34.9 MB1.8k downloadsb3d058ab2e79…Get
  • 1.3-SNAPSHOT10 Jul 20241.21, 1.21.1, 1.21.2, 1.21.3, 1.21.40.0 MB485 downloads4983ae0ef231…Get

Frequently asked

Does Anti-Dupe work on Minecraft 1.21.11?

Yes. 1.21.11 is the newest Minecraft version Anti-Dupe declares support for, and the claim comes from the author's own release metadata rather than from a compatibility list somebody maintains by hand.

Which Minecraft versions does Anti-Dupe support?

Everything the author has declared, from 1.21 up to 1.21.11. The full list is in the table above, with the Java runtime each version needs next to it.

Do I need to install Anti-Dupe on the client or the server?

The server only. Players join with an ordinary Minecraft client and install nothing.

Which platform or loader does Anti-Dupe support?

Bukkit, Spigot, Purpur, Paper. A build for one platform or loader will not necessarily load on another, so this is the first thing to check before the Minecraft version.

Which Java version do I need for Anti-Dupe?

On the newest Minecraft version it supports, Java 21 or newer. The requirement comes from the Minecraft version you run rather than from the plugin itself, so on an older supported Minecraft the answer is that version's Java, not this one.

What licence is Anti-Dupe under?

LicenseRef-All-Rights-Reserved, as stated by the author on the platform we synced it from. Check the project's own page before redistributing or bundling it.

How do I install Anti-Dupe?

Choose the release variant for your server platform. Paper, Spigot, Purpur and Bukkit files go in the server's plugins folder; Fabric, Forge, NeoForge and Quilt files go in the mods folder. Restart after installing and check that the Minecraft version matches your server.

Where do I download Anti-Dupe safely?

Start with the author's page on Modrinth, which is where the data here is synced from. MCReference does not host or repackage files. The download link goes to the source recorded for that release; verify the publisher, filename and checksum before running it.

Works on the same versions

Ordered by how much of the recent Minecraft version coverage overlaps, not by popularity.

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Last checked 4 d ago against Modrinth. We do not host files and we do not republish descriptions; every download link points at the author’s own release.

Is this information wrong or missing something? .