How to Host a Subnautica 2 Server
Subnautica 2 launched in Early Access on May 14, 2026 on PC (Steam, Epic, Windows Store) and Xbox Series X|S, with PC ↔ Xbox crossplay. If you're trying to "host a Subnautica 2 server," the first thing to know is what's actually available.
There is no official Subnautica 2 dedicated-server tool. There's no separate server build, no SteamCMD server app, and no IP/port to host. Co-op is host-based: one player opens their save and friends join, up to 4 players. An official dedicated server is a top community request but hasn't shipped. This guide covers the real options.
Option 1: Host from your own game (built-in co-op)
The default way to play together. One player opens their save and becomes the host; up to three friends join through the in-game friends list or an invite, on PC or Xbox.
- No server software, IP, or port forwarding - it's all handled in-game.
- The world lives in the host's save file; recipes, data entries, and storage are shared with the crew.
- The catch: the world is only live while the host is online. When the host quits, the session ends for everyone.
Option 2: Hand the world off with Upload to Cloud
Subnautica 2 has a built-in save hand-off instead of a server. The host uses Upload to Cloud to generate a short key; a friend pastes it into Import Save and can host the same world from their machine. This lets a group rotate who hosts so the world isn't locked to one person - the closest native equivalent to "passing the server around."
Option 3: Always-online managed hosting
Because there's no dedicated-server binary and the host has to be online, the only way to get a genuinely always-available world is to run it on a machine that's always on. A managed Subnautica 2 host keeps a co-op session live around the clock so the crew can drop in any time, independent of any one player's PC.
- Always available: the world stays up whether or not the original host is online.
- Daily backups: a corrupted save or a bad Early Access patch won't wipe weeks of progress.
- Stable for everyone: a central location replaces "whoever hosts has the best ping."
- Auto-update: Subnautica 2 patches often in Early Access; a managed host keeps the world on the current build.
Which option fits?
| Option | Setup | Players | Best for |
|---|---|---|---|
| Host from your own game | None | 4 | A group that plays at the same time |
| Upload to Cloud hand-off | Minutes | 4 | Rotating who hosts so the world isn't stuck with one person |
| Always-online managed host | ~5 minutes | 4 | Groups on different schedules who want the world up 24/7 |
Frequently Asked Questions
Does Subnautica 2 have a dedicated server?
Not officially - there's no server binary or SteamCMD server app. Co-op is host-based; managed hosting keeps a session online as a workaround.
What player count does Subnautica 2 support?
Up to 4 players in online co-op. The real constraint isn't the cap, it's that the world is only live while the host is playing.
Is Subnautica 2 crossplay? Is it on PS5?
Crossplay works between PC (Steam, Epic, Windows Store) and Xbox Series X|S, including Game Pass, on by default. There is no PlayStation 5 or Nintendo Switch version, so those players can't join.
Can I keep my world online when I'm offline?
Not with built-in host-based co-op - the world stops when the host leaves. Use Upload to Cloud to hand it to whoever is online, or run it on an always-online managed host.
Quick start with Supercraft
Supercraft offers managed, always-online Subnautica 2 co-op hosting - PC + Xbox crossplay, daily backups, automatic updates, and a choice of regions, so your world stays up for the whole crew.