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Minecraft 20w21a

SnapshotLegacy 1.x

Minecraft 20w21a is a Java Edition snapshot released on 20 May 2020 under the classic 1.x numbering. Mojang lists Java 8 as the required runtime. It speaks network protocol 718.

Official artwork published by Mojang for Minecraft 20w21a

Minecraft Snapshot 20w21a

In this snapshot, we're adding support for custom world settings and custom dimensions. This is an early release to hear your feedback about this feature - do note that this support is considered experimental and unsupported. Any custom world settings may
Image and summary: Mojang Studios, from the official Java Edition patch notes. Not affiliated with Mojang.
Released
20 May 2020
Requires Java
Java 8+
Protocol version
718
Data version
2554
Version group
20w
Numbering
Legacy (1.x)
Server software
0 with builds
Position
#520 of 903

Official downloads

Served by Mojang. Verify the checksum before running anything.

FileSizeSHA-1Download
Server jar36.1 MB03b8fa357937…piston-data.mojang.com ↗
Client jar16.5 MB96efb012b756…piston-data.mojang.com ↗

The catalogue on 20w21a

Projects that name 20w21a in their own release metadata. Follow any of these to the full filtered list.

What runs on 20w21a

Builds are counted from each project's own API; declared support comes from the loader's metadata.

Full compatibility
SoftwareLatest buildPublishedChecksumDownload
Fabric Loader0.19.3Not build baseddeclaredloader
Quilt Loader0.30.1-beta.2Not build baseddeclaredloader

Everything in 20w

28 versions in this group.

Filter list
VersionTypeProtocolReleased
20w51aSnapshot107374183316 Dec 2020
20w49aSnapshot10737418322 Dec 2020
20w48aSnapshot107374183125 Nov 2020
20w46aSnapshot107374183011 Nov 2020
20w45aSnapshot10737418294 Nov 2020
20w30aSnapshot74322 Jul 2020
20w29aSnapshot74115 Jul 2020
20w28aSnapshot7408 Jul 2020
20w27aSnapshot7381 Jul 2020
20w22aSnapshot71929 May 2020
20w21aSnapshot71820 May 2020
20w20bSnapshot71714 May 2020
20w20aSnapshot71613 May 2020
20w19aSnapshot7156 May 2020
20w18aSnapshot71429 Apr 2020
20w17aSnapshot71322 Apr 2020
20w16aSnapshot71215 Apr 2020
20w15aSnapshot7118 Apr 2020
20w14aSnapshot7102 Apr 2020
20w13bSnapshot70926 Mar 2020
20w13aSnapshot70825 Mar 2020
20w12aSnapshot70718 Mar 2020
20w11aSnapshot70611 Mar 2020
20w10aSnapshot7054 Mar 2020
20w09aSnapshot70426 Feb 2020
20w08aSnapshot70319 Feb 2020
20w07aSnapshot70214 Feb 2020
20w06aSnapshot7015 Feb 2020

Questions about Minecraft 20w21a

What Java version does Minecraft 20w21a require?

Minecraft 20w21a requires Java 8 or newer. Mojang publishes this in the version metadata, so an older runtime refuses to start it.

What protocol version does Minecraft 20w21a use?

Minecraft 20w21a speaks protocol 718. A client and a server can only connect when their protocol numbers match.

Where do I download the Minecraft 20w21a 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.

Go deeper

Full compatibility for 20w21aServer software, loaders and the Java requirement in one placeJava 8 downloadsVerified Temurin builds for Windows, macOS and LinuxEverything in 20wSnapshots, pre-releases and candidates in this groupHow Minecraft version numbers workWhy 1.21 was followed by 26.1, and what happened to 1.22

Metadata from Mojang’s official version manifest. Protocol and data versions from the PrismarineJS minecraft-data project.