Minecraft 1.17-rc1
Release candidateLegacy 1.xMinecraft 1.17-rc1 is a Java Edition release candidate released on 4 Jun 2021 under the classic 1.x numbering. Mojang lists Java 16 as the required runtime. It speaks network protocol 1073741858.
Minecraft 1.17 Release Candidate 1
We're now releasing the first (and hopefully only) release candidate for Caves & Cliffs: Part I. If there are no major issues following this release, no further changes will be done before the full release. Happy mining! The Caves & Cliffs Previe
- Released
- 4 Jun 2021
- Requires Java
- Java 16+
- Protocol version
- 1073741858
- Data version
- 2722
- Version group
- 1.17
- Numbering
- Legacy (1.x)
- Server software
- 1 with builds
- Position
- #578 of 903
Official downloads
Served by Mojang. Verify the checksum before running anything.
| File | Size | SHA-1 | Download |
|---|---|---|---|
| Server jar | 41.6 MB | 4de310c8c4f4… | piston-data.mojang.com ↗ |
| Client jar | 18.6 MB | 006320ab2a99… | piston-data.mojang.com ↗ |
The catalogue on 1.17-rc1
Projects that name 1.17-rc1 in their own release metadata. Follow any of these to the full filtered list.
What runs on 1.17-rc1
Builds are counted from each project's own API; declared support comes from the loader's metadata.
| Software | Latest build | Published | Checksum | Download |
|---|---|---|---|---|
| Sponge | #2 | 28 Jul 2026 | Not published | jar ↗ |
| Sponge | 1.17-rc1-9.0.0-RC641 | Not build based | inferred | loader |
| Fabric Loader | 0.19.3 | Not build based | declared | loader |
| Quilt Loader | 0.30.1-beta.2 | Not build based | declared | loader |
Everything in 1.17
14 versions in this group.
| Version | Type | Protocol | Released |
|---|---|---|---|
| 1.17.1 | Release | 756 | 6 Jul 2021 |
| 1.17.1-rc2 | Release candidate | 1073741864 | 5 Jul 2021 |
| 1.17.1-rc1 | Release candidate | 1073741863 | 1 Jul 2021 |
| 1.17.1-pre3 | Pre-release | 1073741862 | 30 Jun 2021 |
| 1.17.1-pre2 | Pre-release | 1073741861 | 29 Jun 2021 |
| 1.17.1-pre1 | Pre-release | 1073741860 | 18 Jun 2021 |
| 1.17 | Release | 755 | 8 Jun 2021 |
| 1.17-rc2 | Release candidate | 1073741859 | 7 Jun 2021 |
| 1.17-rc1 | Release candidate | 1073741858 | 4 Jun 2021 |
| 1.17-pre5 | Pre-release | 1073741857 | 3 Jun 2021 |
| 1.17-pre4 | Pre-release | 1073741856 | 2 Jun 2021 |
| 1.17-pre3 | Pre-release | 1073741855 | 1 Jun 2021 |
| 1.17-pre2 | Pre-release | 1073741854 | 31 May 2021 |
| 1.17-pre1 | Pre-release | 1073741853 | 27 May 2021 |
Questions about Minecraft 1.17-rc1
What Java version does Minecraft 1.17-rc1 require?
Minecraft 1.17-rc1 requires Java 16 or newer. Mojang publishes this in the version metadata, so an older runtime refuses to start it.
What protocol version does Minecraft 1.17-rc1 use?
Minecraft 1.17-rc1 speaks protocol 1073741858. A client and a server can only connect when their protocol numbers match.
Where do I download the Minecraft 1.17-rc1 server jar?
Mojang hosts it directly. This page links to the official file with its SHA-1 checksum and size, so you can verify the download before you run it. We do not mirror or repackage it.
Which server software supports Minecraft 1.17-rc1?
Sponge publish builds for 1.17-rc1. Each one is listed with its build number and checksum.
Go deeper
Metadata from Mojang’s official version manifest. Protocol and data versions from the PrismarineJS minecraft-data project.