I've been waiting for this one for years. Subnautica was one of those rare survival games that genuinely scared me in a good way, and the single biggest complaint the community had was that you couldn't share the experience with anyone else. Nitrox tried to fix that, and credit to the modders who built it, but it was always held together with duct tape and prayers. Subnautica 2 enters Early Access on 14 May 2026, and multiplayer is in the box this time.
I need to start with a correction. An earlier version of this guide walked through SteamCMD app IDs, config file paths, port numbers, and hardware recommendations as if they were settled facts. They weren't. The app ID I cited belonged to a completely unrelated product. That was AI-assisted content that didn't get fact-checked before it went live, and I'm sorry. I've rewritten the page to reflect what I can actually verify.
What's confirmed at Early Access launch
Release. 14 May 2026, 8am PDT. Steam, Epic Games Store, Microsoft Store, Xbox Series X|S. $29.99 USD. Day-one Xbox Game Pass and PC Game Pass.
Multiplayer. Up to four players in a shared world, including the host. Optional, so you can still play solo. Designed in from the start rather than retrofitted.
Crossplay. PC and Xbox players can join the same session. Matchmaking and connectivity run through Epic Online Services.
Architecture. Peer-to-peer, hosted on one player's machine. The host owns the world save. Community discussion on the official Steam forum reflects this, and the Steam store text only describes co-op multiplayer with friends, with no mention of dedicated servers.
That last point is the one that matters for anyone planning to host.
What is not confirmed
Unknown Worlds has not announced a dedicated server tool for Subnautica 2. There is no separate "Dedicated Server" entry on Steam, no public SteamCMD app for it, and no reference to one in the official store page or the Xbox Game Preview announcement. Anything you see online claiming a specific app ID, config path, or port set should be treated as unverified at best.
That doesn't mean dedicated servers are off the table forever. Unknown Worlds could add them during Early Access. The community modding scene could build a Nitrox-style solution for the sequel given time. UE5 has good dedicated server scaffolding, and some titles add an official server later in their lifecycle. None of that is the same as "dedicated servers at launch", and I'm not going to pretend otherwise.
What that means for server admins
If you're the kind of admin who likes to be ready ahead of launch, the honest advice is that there isn't much to prepare for on 14 May, because there's nothing to install yet.
What is worth doing:
Test the peer-to-peer experience first. Play a session with your group as soon as the game drops. Confirm whether host-only multiplayer is good enough for what you actually want, or whether the friction (host availability, host hardware, host internet) makes a hosted solution worth waiting for.
Watch the patch notes. Early Access updates are where dedicated server support, if it lands, is most likely to be announced.
Watch the modding scene. If a Nitrox-equivalent appears for Subnautica 2, that's the path most communities will take to always-on worlds.
Don't trust appid-and-port-list guides yet. If a guide cites specific SteamCMD app IDs, config paths, or RCON commands for Subnautica 2 today, ask where the source is. If it's another hosting provider's blog and not Unknown Worlds or a verifiable build inspection, treat it as content rot.
Where LOW.MS stands
We'll inspect the Early Access build the day it drops. If there's a dedicated server binary in there, we'll have hosting up quickly. If there isn't, I'd rather tell you that straight than ship a fake product. Either way, this page will reflect reality, not marketing.
If your group wants persistent worlds, low ping for everyone, and backups that don't depend on one player's PC staying online, those are real problems, and dedicated hosting solves them. They're problems Subnautica 2 cannot solve at launch with the multiplayer it's shipping. We'll let you know the moment that changes.
For the broader overview of what's confirmed about co-op and crossplay, see Subnautica 2 Multiplayer and Server Hosting: What We Know. This page is the technical companion to that one.