Subnautica 2 Dedicated Server: What's Actually Available
Updated June 2026 - reflects the Early Access build and Unknown Worlds' published roadmap.
The honest answer: as of June 2026, Subnautica 2 does not ship an official dedicated-server tool. There is no separate server AppID on SteamCMD, no standalone server binary, and no IP/port you connect to. Co-op is host-based (peer-to-peer) - one player hosts from their own copy of the game and up to three friends join. The good news: official dedicated-server support is on Unknown Worlds' Early Access roadmap, it just has no release date yet and is not in the launch build.
If you searched for "Subnautica 2 dedicated server setup," this page explains how hosting really works right now, what's confirmed for later, and the practical ways to get a persistent, always-available world today.
How hosting works today
- One player hosts. From the main menu, the host picks "Host a new multiplayer game" (or hosts an existing co-op save) - no server software, IP address, or port forwarding involved.
- Friends join from the menu. Everyone else chooses "Join Friends" and picks the host's active session from their platform/in-game friends list. There is no server browser and no manual connect string.
- The world lives in the host's save. Every sub, base, and scanned fragment is stored in that one file. Recipes, data-bank entries, and base storage are shared with everyone in the world.
- Up to 4 players (one host + three), drop-in and drop-out.
- Saves are local, backed up to Steam Cloud. Each player keeps the world locally; the host's machine holds the authoritative copy of the session.
- The world is only live while the host is online. When the host quits, the session ends - this is the single biggest limitation an official dedicated server would solve.
Turning a solo run into a co-op world
You don't have to start over to play with friends. On the main menu choose "Play Single Player," select an existing save, and pick "Convert to Multiplayer." That save can then be hosted as a co-op session with the same bases, subs, and progress intact. It's the cleanest way to bring an established world into multiplayer, and it works in both directions when paired with the cloud hand-off below.
Moving the world between players: Upload to Cloud
Because there's no server, the game ships a built-in save hand-off. The host picks "Upload to Cloud" from the main menu to generate a short key; a friend pastes it into Import Save and can then host the same world from their own 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." The catch: it's a manual swap, so whoever hosted last must remember to upload before the next person can carry the world forward.
Keeping a world online 24/7 (managed hosting)
Because there's no official server 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. That's what a managed Subnautica 2 host does - it keeps a co-op session live around the clock so the crew can drop in any time, with daily backups protecting the save. It's the practical answer to "I want a persistent world," given the game ships no dedicated-server binary.
Always available
The world stays up whether or not the original host is online.
Daily backups
A corrupted save or bad patch won't wipe weeks of co-op progress.
Stable for everyone
No more "whoever hosts has the best ping" - a central location serves the whole crew.
What's confirmed for later: official dedicated servers
Unknown Worlds has placed official dedicated-server support on the Subnautica 2 Early Access roadmap, so the "always-on" hosting that's missing today is a stated goal rather than a maybe. There is no firm date: the studio has said Early Access is expected to run roughly two to three years, with co-op improvements weighted toward an early update and bigger systems landing across later drops. Until that ships, the host-based model above is the whole story for vanilla multiplayer. You can read the official plan on the Subnautica 2 Steam page.
Platforms and crossplay
Subnautica 2 launched in Early Access on May 14, 2026 on PC (Steam, Epic Games Store, Windows Store) and Xbox Series X|S, including Game Pass. Crossplay between PC and Xbox is on by default. There is no PlayStation 5 or Nintendo version, so those players cannot join. See the crossplay guide for the full platform breakdown.
Does Subnautica 2 have a dedicated server?
Not yet. As of June 2026 there is no server binary or SteamCMD AppID, and co-op is host-based. Official dedicated-server support is on Unknown Worlds' Early Access roadmap but has no release date. Until then, a managed always-online host keeps a session up as the practical workaround.
When are official dedicated servers coming?
No date has been given. Dedicated servers are confirmed for the Early Access roadmap, which the studio expects to span about two to three years, so treat it as a planned feature rather than something you can run today.
Can I turn my single-player save into a co-op world?
Yes. From the main menu choose "Play Single Player," open the save, and select "Convert to Multiplayer." Your bases, subs, and progress carry over and the save becomes hostable as a co-op session.
How many players can play together?
Up to 4 in online co-op (one host plus three). The cap isn't the real constraint - the world only being live while the host is online is.
Does it support crossplay?
Yes, between PC (Steam, Epic, Windows Store) and Xbox Series X|S, including Game Pass. There is no PS5 version, so PS5 cannot join.
Can I keep my world running when I'm offline?
Not with vanilla host-based co-op - the world stops when the host leaves. Either rotate hosting with Upload to Cloud, or run the world on an always-online managed host.
Next steps
- How Subnautica 2 4-player co-op works
- Subnautica 2 crossplay guide (PC + Xbox)
- Server / host hardware requirements
- Back to Subnautica 2 Wiki Home
For game devs: If you're building a multiplayer game and want the backend layer (auth, save, leaderboards, server registry) without writing it yourself, see our sister project Supercraft GSB - open-source backend for multiplayer games.