Minecraft 21w42a
SnapshotLegacy 1.xMinecraft 21w42a is a Java Edition snapshot released on 20 Oct 2021 under the classic 1.x numbering. Mojang lists Java 16 as the required runtime. It speaks network protocol 1073741870.
Minecraft Snapshot 21w42a
It's time for a musical snapshot! We're now introducing new music for Caves & Cliffs: Part II. This time around we have a bunch of new tracks composed by the talented Lena Raine and Kumi Tanioka. These tracks are also available on Spotify for you to l
- Released
- 20 Oct 2021
- Requires Java
- Java 16+
- Protocol version
- 1073741870
- Data version
- 2840
- Version group
- 21w
- Numbering
- Legacy (1.x)
- Server software
- 0 with builds
- Position
- #592 of 903
Official downloads
Served by Mojang. Verify the checksum before running anything.
| File | Size | SHA-1 | Download |
|---|---|---|---|
| Server jar | 44.0 MB | cf518e2c80fd… | piston-data.mojang.com ↗ |
| Client jar | 19.0 MB | 05781f1ce374… | piston-data.mojang.com ↗ |
The catalogue on 21w42a
Projects that name 21w42a in their own release metadata. Follow any of these to the full filtered list.
What runs on 21w42a
Builds are counted from each project's own API; declared support comes from the loader's metadata.
| Software | Latest build | Published | Checksum | Download |
|---|---|---|---|---|
| Fabric Loader | 0.19.3 | Not build based | declared | loader |
| Quilt Loader | 0.30.1-beta.2 | Not build based | declared | loader |
Everything in 21w
25 versions in this group.
| Version | Type | Protocol | Released |
|---|---|---|---|
| 21w44a | Snapshot | 1073741872 | 3 Nov 2021 |
| 21w43a | Snapshot | 1073741871 | 27 Oct 2021 |
| 21w42a | Snapshot | 1073741870 | 20 Oct 2021 |
| 21w41a | Snapshot | 1073741869 | 13 Oct 2021 |
| 21w40a | Snapshot | 1073741868 | 7 Oct 2021 |
| 21w39a | Snapshot | 1073741867 | 29 Sept 2021 |
| 21w38a | Snapshot | 1073741866 | 23 Sept 2021 |
| 21w37a | Snapshot | 1073741865 | 15 Sept 2021 |
| 21w20a | Snapshot | 1073741852 | 19 May 2021 |
| 21w19a | Snapshot | 1073741851 | 12 May 2021 |
| 21w18a | Snapshot | 1073741850 | 5 May 2021 |
| 21w17a | Snapshot | 1073741849 | 28 Apr 2021 |
| 21w16a | Snapshot | 1073741847 | 21 Apr 2021 |
| 21w15a | Snapshot | 1073741846 | 14 Apr 2021 |
| 21w14a | Snapshot | 1073741845 | 7 Apr 2021 |
| 21w13a | Snapshot | 1073741844 | 31 Mar 2021 |
| 21w11a | Snapshot | 1073741843 | 17 Mar 2021 |
| 21w10a | Snapshot | 1073741842 | 10 Mar 2021 |
| 21w08b | Snapshot | 1073741841 | 25 Feb 2021 |
| 21w08a | Snapshot | 1073741840 | 24 Feb 2021 |
| 21w07a | Snapshot | 1073741839 | 17 Feb 2021 |
| 21w06a | Snapshot | 1073741838 | 10 Feb 2021 |
| 21w05b | Snapshot | 1073741837 | 4 Feb 2021 |
| 21w05a | Snapshot | 1073741836 | 3 Feb 2021 |
| 21w03a | Snapshot | 1073741835 | 20 Jan 2021 |
Questions about Minecraft 21w42a
What Java version does Minecraft 21w42a require?
Minecraft 21w42a 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 21w42a use?
Minecraft 21w42a speaks protocol 1073741870. A client and a server can only connect when their protocol numbers match.
Where do I download the Minecraft 21w42a 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
Metadata from Mojang’s official version manifest. Protocol and data versions from the PrismarineJS minecraft-data project.