Minecraft 17w31a

SnapshotLegacy 1.x

Minecraft 17w31a is a Java Edition snapshot released on 1 Aug 2017 under the classic 1.x numbering. Mojang lists Java 8 as the required runtime. It speaks network protocol 336.

Released: 1 Aug 2017
Requires Java: Java 8+
Protocol version: 336
Data version: 1239
Version group: 17w
Numbering: Legacy (1.x)
Server software: 0 with builds
Position: #344 of 903

Official downloads

Served by Mojang. Verify the checksum before running anything.

File	Size	SHA-1	Download
Server jar	28.8 MB	`00b83b98c91d…`	piston-data.mojang.com ↗
Client jar	9.7 MB	`67bfebbd0af5…`	piston-data.mojang.com ↗

The catalogue on 17w31a

Projects that name 17w31a in their own release metadata. Follow any of these to the full filtered list.

Everything in 17w

23 versions in this group.

Filter list

Version	Type	Protocol	Released
17w50a	Snapshot	351	11 Dec 2017
17w49b	Snapshot	350	7 Dec 2017
17w49a	Snapshot	349	6 Dec 2017
17w48a	Snapshot	348	27 Nov 2017
17w47b	Snapshot	347	23 Nov 2017
17w47a	Snapshot	346	22 Nov 2017
17w46a	Snapshot	345	15 Nov 2017
17w45b	Snapshot	344	10 Nov 2017
17w45a	Snapshot	343	8 Nov 2017
17w43b	Snapshot	342	26 Oct 2017
17w43a	Snapshot	341	25 Oct 2017
17w31a	Snapshot	336	1 Aug 2017
17w18b	Snapshot	327	4 May 2017
17w18a	Snapshot	326	3 May 2017
17w17b	Snapshot	325	27 Apr 2017
17w17a	Snapshot	324	26 Apr 2017
17w16b	Snapshot	323	21 Apr 2017
17w16a	Snapshot	322	20 Apr 2017
17w15a	Snapshot	321	12 Apr 2017
17w14a	Snapshot	320	5 Apr 2017
17w13b	Snapshot	319	31 Mar 2017
17w13a	Snapshot	318	30 Mar 2017
17w06a	Snapshot	317	8 Feb 2017

Questions about Minecraft 17w31a

What Java version does Minecraft 17w31a require?

Minecraft 17w31a 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 17w31a use?

Minecraft 17w31a speaks protocol 336. A client and a server can only connect when their protocol numbers match.

Where do I download the Minecraft 17w31a 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 17w31aServer software, loaders and the Java requirement in one place Java 8 downloadsVerified Temurin builds for Windows, macOS and Linux Everything in 17wSnapshots, pre-releases and candidates in this group How 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.