Compatibility
What works with Minecraft 1.21.6
Released 17 Jun 2025. Everything below comes from the projects' own published data, and each row says how we know.
Java requirement
Java 21 or newer
Published by Mojang for this exact version. An older runtime will not start it. Get a verified build.
Server software with builds
Real, downloadable builds for 1.21.6.
| Software | Build | Published | Size | Checksum | Download |
|---|---|---|---|---|---|
| ASPaper | #16689 | 29 Jun 2025 | 57.5 MB | Not published | jar ↗ |
| DivineMC | #9 | 2 Jul 2025 | 63.6 MB | Not published | jar ↗ |
| Folia | #6 | 29 Jun 2025 | 50.4 MB | 917a8abaa542… | jar ↗ |
| Leaf | #29 | 21 Jul 2025 | 65.7 MB | Not published | jar ↗ |
| LooHP Limbo | #54 | 19 Jun 2025 | 7.6 MB | Not published | jar ↗ |
| Paper | #48 | 30 Jun 2025 | 50.2 MB | 35e2dfa66b34… | jar ↗ |
| Pluto | #13 | 13 Apr 2026 | 50.6 MB | Not published | jar ↗ |
| Purpur | #2465 | 30 Jun 2025 | Unknown | Not published | jar ↗ |
| Spigot | #4518 | 30 Jun 2025 | 76.3 MB | Not published | jar ↗ |
| Sponge | #3 | 28 Jul 2026 | 8.6 MB | Not published | jar ↗ |
Mod loaders
Support declared in each loader's own metadata.
- Spigot#4518inferredsupported
- DivineMC#9inferredsupported
- ASPaper#16689inferredsupported
- LooHP Limbo#54inferredsupported
- Sponge1.21.6-16.0.0-RC2237inferredsupported
- Leaf#29inferredsupported
- Pluto#13inferredsupported
- Minecraft Forge56.0.9declaredsupported
- Fabric Loader0.19.3declaredsupported
- Quilt Loader0.30.1-beta.2declaredsupported
- NeoForge21.6.20-betadeclaredsupported
Frequently asked
Which Java version does Minecraft 1.21.6 need?
Java 21 or newer. Mojang publishes this requirement in the version metadata, so an older runtime will refuse to start the server.
Which server software supports 1.21.6?
ASPaper, DivineMC, Folia, Leaf, LooHP Limbo, Paper, Pluto, Purpur, Spigot, Sponge publish builds for 1.21.6.