Viper AntiXray
Viper AntiXray runs only on the server and uses Fabric, replacing the real ore data in chunk packets with stone, deepslate and fake ore blocks, so that players using X-ray tools see nothing useful.
What it does
The mod works on the network layer. Chunk packets are transformed on dedicated worker threads, with a configurable pool size, so world generation, entity ticking and player movement are not blocked. Unexposed ores are sent as fake blocks, and only the real blocks a player has legitimately seen are revealed, which is why no client installation is needed.
Vanilla players connect normally and see the legitimate world. Density of fake ores per chunk is configurable, and a small share of blocks below Y=16 is treated separately. Each dimension can use its own engine mode, height range and block list, and custom dimensions are set by dimension ID. Viper AntiXray requires Fabric API, and it is published for Fabric across 17 release versions, 1.21 – 26.3, under All rights reserved; it is not open source.
Key features
Asynchronous packet transformation
Chunk packets are processed on worker threads with a configurable pool size, leaving the main thread free.
Per-dimension configuration
Each dimension can select its own engine mode, height limits and block lists, and custom dimensions are specified by ID.
Custom ore tags
Ores are hidden through the viperantixray:hidden block tag, so Diamond, Emerald and Ancient Debris can be added or replaced with a tag.
Honey-pot detection
Mining a honey-pot block raises a player's suspicion score, stored in viperantixray:player data NBT, and sends an alert to operators with the viperantixray.alerts permission.
Paper-derived engine
The obfuscation logic is a port of the Async Anti-Xray patch used on Paper and Spigot servers, wrapped in a Fabric module with event-driven feature modules.
Gallery
Compatibility
Latest build for each game version and loader.
26.x5 of 5 versions with builds
1.21.x12 of 12 versions with builds
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Required 1
Use cases
Who it’s for: Server owners who run Fabric servers on 1.21 – 26.3 and want X-ray protection without installing anything on player clients.
How it compares
Viper Proxy is a client-side only Fabric mod under the MIT License, open source, for 1.21.10 – 26.2, so it does not protect a server. Meow Anti-Xray is server-side only, open source under the MIT License and published for Fabric and NeoForge across 26.1 – 26.3, so it covers a wider loader set. Legi AntiXray is a NeoForge mod for 1.21.1 – 26.1.2, server-side only and not open source. RadarZone is a Fabric mod for 1.21.1 that runs on client and server, under All rights reserved.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Viper AntiXray | Fabric | 1.21 – 26.3 | Server-side only | 2026-10-01 |
| Viper Proxy | Fabric | 1.21.10 – 26.2 | Client-side only | 2026-07-12 |
| Meow Anti-Xray | Fabric and NeoForge | 26.1 – 26.3 | Server-side only | 2026-10-10 |
| Legi AntiXray | NeoForge | 1.21.1 – 26.1.2 | Server-side only | 2026-05-02 |
| RadarZone | Fabric | 1.21.1 | Client and server | 2026-08-08 |
Questions
Does Viper AntiXray need Fabric API?
Do players need to install Viper AntiXray?
Can the fake ores be changed?
In the catalog
Viper AntiXray is one of 8,499 Technology mods on ModsFinder, and one of 4,201 Technology mods for Fabric. 8,071 mods support Minecraft 26.3.
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What the author says
ViperAntiXray is a server-side only Fabric mod that completely eliminates X-ray cheating by obfuscating chunk packets sent to clients. Unlike texture-pack based solutions or client-side "anti-cheat" mods, ViperAntiXray operates at the network layer the server sends fake block data for unexposed ores, and only reveals…
Official listing
- Modrinth page
- modrinth.com/mod/viper-antixray
- Owner
- Fabric Server Essentials
- Published
- 2026-06-24
- Updated on Modrinth
- 2026-10-01
- Facts verified
- 2026-10-15