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What is Nitrox for Subnautica?
Nitrox for Subnautica is a free, community-developed multiplayer mod that lets you play the single-player survival game with other people. You can join an existing server or host your own, then play together in either a normal survival run or a more relaxed creative building session. The mod is available for Windows and Linux, and the launcher is currently Windows-only.
What it actually adds
- Co-op play: Team up to explore, gather resources and build bases instead of playing alone.
- Servers: Host your own or join someone else's, with support for large events up to 100 player slots.
- In-game messaging: A built-in chat system, described as cross-platform compatible, so you can coordinate without leaving the game.
- Automatic port forwarding: UPnP support opens the required ports so friends can connect without third-party VPN software.
- Cross-store play: Native cross-play is built in, so players who own the game on different supported stores can play together.
- Localization: The interface and mod text are available in many community-contributed languages.
- Ongoing development: The project is open source and receives regular updates from contributors.
Who it suits
It fits players who have finished or bounced off Subnautica solo and want the social version: a shared survival world with friends, or a low-pressure creative build server. It also suits communities and streamers who want to run larger sessions. The main trade-offs are practical rather than conceptual: it is a mod, not an official mode, so you and everyone you play with need to install it, and the Windows-only launcher means Linux players may have a less polished setup path.
A concrete scenario
Say you and two friends each own Subnautica on different stores. One of you installs the mod, hosts a server, and shares the connection details; the others install the same mod version and join. UPnP handles the port forwarding, and chat keeps everyone in touch while you split up to scan wrecks.
Next step
Check the install guide and FAQ before downloading, and make sure everyone in your group runs the same mod version. If you get stuck or want to find people to play with, the community channels are the fastest route to help.
How do I install Nitrox to play Subnautica multiplayer with friends?
Install Nitrox by downloading it from the official site, running the installer, and then launching Subnautica through the Nitrox Launcher rather than through Steam or Epic directly. The mod handles the multiplayer layer; you still need a legitimate copy of Subnautica installed.
Basic install flow
- Go to Nitrox for Subnautica and download the latest release.
- Run the installer. On Windows, the Nitrox Launcher is the normal entry point; the launcher is listed as Windows-only, even though the mod itself supports Windows and Linux.
- Point the launcher at your Subnautica installation if it does not detect it automatically.
- Launch the game from the Nitrox Launcher, not from your store client.
Getting into a game with friends
- One person hosts: create a server in the launcher, then share the connection details.
- Everyone else joins that server from their own launcher.
- Nitrox includes UPnP support, which automatically opens the required ports so you can often connect without a third-party VPN. If your router or network blocks UPnP, you may still need manual port forwarding.
- In-game messaging is built in, so you do not need to run a separate voice or chat app just to coordinate.
Practical notes
- Hosting supports large sessions, so a small friend group is well within range.
- The mod is open source and community-maintained, which means updates track the game but can lag behind a brand-new Subnautica patch. If the game recently updated, check the blog or guides page before assuming a failed launch is your fault.
- Cross-play between supported stores is built in, so friends do not all need the same storefront.
Next step: read the install guide and FAQ on the same site before your first session. It covers version matching and the common "game won't launch" cases, which will save you more time than troubleshooting mid-session. As a rule of thumb, have every player install the same Nitrox version and the same Subnautica version before hosting.
Is Nitrox compatible with my current Subnautica save file or mods?
Nitrox works with existing Subnautica saves in the sense that you can keep playing a single-player world, but it does not simply "turn on" multiplayer inside your current save. Multiplayer progress lives on a Nitrox server, and each player's local save is separate from that server world. Practically, that means your long-running solo save is not the shared world your friends join.
For mods, the mod is designed around the unmodified game plus Nitrox itself. Other Subnautica mods are not officially supported, and mixing them with Nitrox often causes desyncs, crashes or missing objects for other players.
H3 What this means in practice
- Your current save: back it up before installing anything. You can still load it in normal single-player, but it will not become the multiplayer save.
- Starting multiplayer: create a fresh world on the Nitrox server so all players share the same state.
- Other mods: assume they are incompatible unless the mod author explicitly says otherwise. Even then, test with a throwaway save first.
- Version matching: everyone joining must run the same Subnautica version and the same Nitrox version, or connections will fail.
H3 A sensible next step
If you want to keep your solo progress, treat it as a separate archive: copy the save folder somewhere safe, then start a new Nitrox server world for multiplayer. If a specific mod matters to you, check whether its author mentions Nitrox before adding it, and test in a small private server rather than a public event.
For install steps and known compatibility notes, see Nitrox for Subnautica, and for general modding context Nexus Mods is where many Subnautica mods list their own multiplayer caveats.
How do I host a Nitrox server and set up port forwarding without a VPN?
Hosting a Nitrox server without a VPN comes down to two things: running the server through the Nitrox Launcher, and making sure the required ports are reachable from the internet. Nitrox's own page highlights UPnP support that "automatically opens the required ports," which is the route that avoids both a VPN and manual router configuration in many home setups.
The basic path
- Install Subnautica, then install Nitrox and launch it through the Nitrox Launcher (currently Windows-only per the site).
- In the launcher, start a server as host rather than joining an existing one.
- Let UPnP handle port opening if your router supports it. If it does, your friends can connect using your public IP and the server port.
- If UPnP is disabled or unsupported on your router, fall back to a manual port forward.
Manual port forwarding, step by step
- Give your host machine a static local IP (DHCP reservation in the router is easiest).
- Open your router's admin page and find the port forwarding / virtual server section.
- Forward the Nitrox server port (UDP) to that static local IP. Nitrox's default port is 11000, but confirm the current default in the launcher or install guide, since it can change between versions.
- Allow the same port through your host firewall (Windows Defender Firewall → Inbound Rules).
- Share your public IP with players. Test from outside your network, since connecting to your own public IP from inside often fails due to NAT loopback.
When UPnP is not enough
UPnP fails on many ISP-supplied routers, on carrier-grade NAT (common with some fiber and mobile-broadband ISPs), and on networks where you do not control the router. In those cases a VPN such as Radmin VPN or ZeroTier is the usual workaround — it sidesteps port forwarding entirely by putting everyone on a virtual LAN. The trade-off is that every player must install and join the same virtual network, which is more friction than a plain forwarded port.
Practical notes
- The site advertises support for up to 100 player slots, so slot count is not the limiting factor for a normal friend group; your upload bandwidth and host CPU are.
- Nitrox includes built-in in-game messaging, so you do not need a separate voice or chat tool just to coordinate.
- The mod is open source with regular community updates, so check the version your server runs matches what clients run — mismatched versions are a common connection failure.
Where to get exact current details
The install guide and FAQ on Nitrox for Subnautica is the authoritative place for the current default port, launcher steps, and troubleshooting. For community help with router-specific forwarding, the Nitrox Discord linked from that site is the fastest route, since exact router menus vary widely.
A quick decision rule: if your router has UPnP enabled and you are not behind carrier-grade NAT, try the launcher first. If friends still cannot connect after that, check for CGNAT before spending time on port forwarding — no amount of forwarding will work behind it, and a virtual LAN tool is the realistic alternative.
What are the player limits and performance considerations for large Nitrox sessions?
Nitrox supports large sessions, but player count and performance are separate concerns. The mod's own material advertises hosting support up to 100 players, so the ceiling for a session is generous; how smoothly a session of that size runs depends far more on the host's hardware, connection and the group's play style than on the mod's slot limit.
What the player limit actually means
A high slot count is mainly a hosting allowance, not a promise of smooth performance. Nitrox is community-developed and open source, with regular contributor updates, so stability has improved over time — but large sessions still concentrate all coordination work on the host machine.
Practical considerations for big sessions
- Host upload bandwidth and stability matter more than raw download speed. Every player's position, inventory changes and world events are relayed through the host.
- World changes accumulate. Large shared bases, many vehicles and heavy terraforming create more state for the host to track and sync.
- Distance between players increases synchronisation work; groups that split across the map stress the session more than a group exploring together.
- Mod and version consistency is essential: everyone should run the same Nitrox version and the same additional mods, or connections and behaviour can break.
- UPnP port forwarding is built in, so the host usually doesn't need third-party VPN software to let friends connect.
Choosing a realistic size
For a casual survival playthrough, a small group of roughly two to six players is the comfortable range where the host PC stays responsive and progress stays coordinated. Creative build sessions tolerate more players because there is less moment-to-moment survival state to sync. Reserve sessions near the advertised maximum — up to 100 — for organised events where the host machine is strong, the connection is fast and upload-heavy, and participants accept that performance may vary.
Next step
Before committing to a large event, run a short test session with the intended host and a handful of players, then scale up gradually. Check the install guide and FAQ on Nitrox for Subnautica for version and setup requirements, and use the community channels to compare notes with hosts who have already run big sessions.
Where can I find active Nitrox servers and get help from the community?
The Nitrox community hub is Nitrox for Subnautica. Its "Connect & chat with other Nitrox players" section points to the project's Discord, which is where server listings, troubleshooting help and version announcements concentrate. The page also notes a Discord presence of 25K+ online, so questions about hosting or joining tend to get answered quickly.
For a first session, the practical path is:
- Read the install guide and FAQ page on the same site before touching a server, since mismatched mod versions are the usual cause of failed joins.
- Use the in-game messaging system to coordinate with whoever is hosting.
- Ask in the community channel if a server refuses connections — the built-in UPnP support handles automatic port forwarding, so most remaining issues are configuration or version related.
If you would rather play with people you already know, hosting your own server is simpler than hunting for a public one; the page states support for up to 100 player slots, which suits large events as well as small friend groups.
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