Server IP

Unstable SMP IP, Port, and Version

The official public address for Unstable SMP is unstablesmp.io. Minecraft Java Edition, no port needed.

Updated

Minecraft Java EditionIP: unstablesmp.ioNo port is needed.
Player slots14,0001.21.1+
unstablesmp.io

Minecraft Java Edition only. Bedrock Edition is not supported and there is no Bedrock port. Play on PC, Mac or Linux.

What is the Unstable SMP IP?

The current official Unstable SMP server address is unstablesmp.io. This is the only address the team publishes, and it appears on this site, in the official Discord and in the store. Any other address claiming to be Unstable SMP is not official.

Searching for the Unstable SMP IP, or for the public Unstable SMP address? It is unstablesmp.io, and it is the same on both editions.

Searching for the Unstable SMP IP, or for the public Unstable SMP address? It is unstablesmp.io.

Java Edition connection

  1. Open Minecraft Java Edition.
  2. Click Multiplayer, then Add Server.
  3. Enter unstablesmp.io as the server address.
  4. Leave the port field blank and click Done.
  5. Select the server and join.

No port is needed on Unstable SMP. Entering unstablesmp.io:anything is the most common reason a correct IP still fails to connect.

Full walkthrough on the Java join guide, including launcher and authentication fixes.

Requirements

What you need to join Unstable SMP
RequirementDetail
Minecraft editionJava Edition
Client version1.21.1+
AccountLegitimate, purchased Minecraft account
PlatformsWindows, macOS, Linux
WhitelistNot required
CostFree

Full connection reference

Unstable SMP connection details
SettingValue
Server addressunstablesmp.io
PortNot used
Supported version1.21.1+
Server softwarePaper 26.3
Player slots14,000
WhitelistNot required
Cost to joinFree
Cracked clientsNot allowed

Supported versions

The live server advertises 1.21.1+ and runs Paper 26.3. Unstable SMP normally serves multiple versions through its proxy, so a recent 1.21+ client will usually connect without changes.

If Minecraft reports an outdated client or server, check the current compatibility announcement in the official Discord rather than reinstalling the game.

Do I need a whitelist or a rank?

No. Unstable SMP is a public survival multiplayer server. There is no whitelist, no application, no friend request and no minimum purchase. Any player with a legitimate Minecraft account can join with the IP above and start playing immediately.

A legitimate Minecraft Java Edition account is the only requirement. Cracked launchers, offline mode and shared logins are banned.

Is this the right address?

Verify before you connect. Only https://www.unstablesmp.io and the official Discord publish the address:

Website

https://www.unstablesmp.io

This site. The canonical Unstable SMP domain.

Open Discord

Official Discord

Announcements and verified channels.

Open Store

Official Store

Ranks, gems and server purchases.

Open Reference

Official Sources

The full verified link list.

Open

Other domains that look similar to unstablesmp.io are not Unstable SMP. Joining a lookalike address puts your account at risk and connects you to a different world entirely.

Related pages

Start Here

How to Join Unstable SMP

Use unstablesmp.io as the official IP, then follow the guide for your edition.

Open guide Fix It

Connection Troubleshooting

Every connection error with its fix, in order.

Fix connection issues Rules

Rules and Allowed Mods

What is and is not allowed once you are connected.

Read the rules Overview

Public Unstable SMP Server

Gameplay, features and what makes the server different.

Read the overview

Unstable SMP IP FAQ

Is Unstable SMP a public Minecraft server?

Yes. Unstable SMP is a public Minecraft survival multiplayer (SMP) server. Anyone with a legitimate Minecraft Java Edition account can join without a whitelist or an application.

What is the Unstable SMP IP?

The official Unstable SMP IP is unstablesmp.io. Open Minecraft Java Edition, click Multiplayer, click Add Server, and enter unstablesmp.io. No port is needed.

How do I join Unstable SMP on Java Edition?

Open Minecraft Java Edition, click Multiplayer, click Add Server, then enter unstablesmp.io as the server address and join. Do not add a port unless Minecraft explicitly asks for one.

Does Unstable SMP support Bedrock Edition?

No. Unstable SMP runs on Minecraft Java Edition only. Bedrock Edition is not supported and there is no Bedrock port. Play on PC, Mac or Linux.

Can I join Unstable SMP on cracked Minecraft?

No. Unstable SMP requires a legitimate, purchased Minecraft account. Cracked launchers, shared accounts and stolen credentials are not allowed and result in a permanent ban.

What Minecraft version does Unstable SMP support?

The live server advertises 1.21.1+ for Java and Paper 26.3 server software. Unstable SMP usually runs several versions at once through its proxy, so check the current announcement in Discord if your client is refused.

How many players can join Unstable SMP at once?

The server slot count is 14,000 players. The live count is shown on this site and updates automatically from the server status feed.

Are hacked clients allowed on Unstable SMP?

No. KillAura, reach, ESP and other cheat clients are banned. Limited, non-cheat optimisation mods such as Sodium, Lithium and Fabric API are allowed. See the full Unstable SMP rules for the exact list.

Quick Answer

Official IP: unstablesmp.io for Minecraft Java Edition. No port needed. Discord: https://discord.gg/unstable-network.

Server IPunstablesmp.io Java EditionHow to join DiscordOfficial server profile