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What is DMP?
DMP is a multiplayer mod for Kerbal Space Program. It lets multiple players share a single space program: you can watch other people's spacecraft (and their spectacular crashes) and fly missions together, including something as ambitious as a joint trip to the Moon.
What you actually need
- DMP Client — download and install it, then pick a server from the server list to join.
- A server to play on — the site maintains a server list so you can find an existing community rather than hosting your own.
- Voice chat (optional) — DMP runs its own Mumble server for voice comms; connect to the same host on the default Mumble port.
If you'd rather run your own
Hosting is a documented path, not a black box: download the server, forward the mod's default port in your router, and if you want your server to appear publicly, install the reporting server plugin so it shows up in the server list.
Who it's for, and the trade-offs
It suits KSP players who want company — cooperative station building, formation flying, or just an audience for a launch gone wrong. The catch is the usual one for multiplayer mods: everyone needs a compatible mod setup, and a shared save means shared consequences, so griefing, time-warp conflicts and version mismatches are community-management problems rather than technical ones the mod can erase. Expect to spend a little time matching versions and picking a server with rules you can live with.
Next step: open DMP and check the Downloads and Serverlist pages first — confirm the client version matches the servers currently listed, then join a low-population server to test your install before committing to a long campaign.
How do I install the DMP client to play Kerbal Space Program multiplayer?
Download the DMP client, install it into your Kerbal Space Program setup, then pick a server from the official server list and connect. The mod's own site is DMP, where the client, server files and server list live.
What the site says to do
DMP describes itself as a multiplayer mod for Kerbal Space Program, and its instructions are deliberately short: download the client, install it, then join a server from the server list. That's the whole flow — there is no account system described, and no purchase step, so treat it as a mod install rather than a game launcher.
A practical install sequence
- Check which KSP version the current client build targets, and match it. Multiplayer mods break when the game updates underneath them.
- Make a clean copy of your KSP folder for multiplayer. Keep your single-player career or science save separate, because shared saves and mod sets can conflict.
- Install the client into that copy, following the mod's own download page rather than a third-party mirror.
- Launch once in single-player to confirm the game still loads before adding multiplayer.
- Open the server list, choose a server with a compatible version and a populated player count, and connect.
If you want voice chat while flying, the site notes that DMP runs its own Mumble server at d-mp.org on the default port, with the Mumble client downloaded separately.
Choosing between joining and hosting
| Situation | What you need | Trade-off |
|---|---|---|
| You just want to fly with others | Client plus a server from the list | You depend on someone else's uptime, rules and mod set |
| You want control over mods and saves | Client plus the server download | You must forward the DMP default port in your router |
| You want your server publicly listed | The reporting server plugin | Extra setup step beyond hosting itself |
Hosting is the bigger commitment: port forwarding, version discipline and keeping the server updated. Joining is the faster route and the sensible first test of whether you enjoy KSP multiplayer at all.
Pick your next step
If you have never played KSP with others, install the client into a duplicate game folder and join one server before hosting anything. If you already run modded KSP and want a specific group of friends, download the server, forward the port, and only then consider the reporting plugin for public listing.
How do I host my own DMP server and get it listed on the serverlist?
To host your own DMP server, download the server software from the Downloads section of DMP, run it, and forward the DMP default port (6702) in your router. To appear on the public Serverlist, also install the DMP Reporting Server plugin, which is what registers your server with the listing.
What each step actually involves
- Download the server build. The site's Downloads page is the source for the server package; the client is a separate download, so don't confuse the two.
- Run it on a machine that stays online. A spare PC or a small VPS works better than your main gaming rig, since players connect whenever you're not around.
- Forward port 6702 (UDP and TCP). This is the DMP default port. Without the forward, players on the internet can't reach you even though the server looks fine locally.
- Add the Reporting Server plugin. This is the step that separates "a server people can join by IP" from "a server strangers can find." Install it after the base server is running and reachable.
Getting listed, and keeping the listing
The plugin reports your server's details to the central list, so the practical sequence is: server running → port reachable from outside → plugin installed → check the Serverlist for your entry. If your server drops off the list, the usual causes are a changed IP address, a router restart that cleared the port forward, or the plugin not loading with the server.
Before you open it to the public
Decide what kind of server you want. A private server for a few friends doesn't need the reporting plugin at all — just share your IP and port. A public server does, and it also means hosting for strangers, so consider:
- Uptime expectations. Players who find you through the list will expect the server to be up reasonably often.
- Mod matching. In KSP multiplayer, mismatched mods and versions are a common source of failed connections, so state your mod setup clearly wherever you announce the server.
- Voice. DMP runs its own Mumble server at d-mp.org on the default port 64738, which is handy for coordinating with players once they're in.
A reasonable first test
Start the server, connect to it yourself from a second machine or over a mobile hotspot (not your home network), and confirm you can join by IP. Then add the reporting plugin and refresh the Serverlist. If your own external connection works but the listing doesn't appear, the problem is almost always the plugin or the reporting connection rather than the port forward.
For anything version-specific — which server build pairs with which KSP release, or plugin configuration details — the KSP Forums thread linked from the site is the better place to check, since mod compatibility shifts over time.
Which DMP servers are currently active and how do I join one?
The official site does not list live server status on the page itself; it points you to its Serverlist page, which is where current active servers are shown. So the reliable answer to "which servers are active right now" is: check the Serverlist on the site rather than relying on any static list, because activity changes as hosts come and go. You can start at DMP.
How to join a server
- Download the DMP client from the site's Downloads page.
- Install it alongside your existing Kerbal Space Program installation.
- Open the Serverlist, pick a server that is online and matches your KSP version.
- Connect, and if the server uses voice chat, join its Mumble server — the site notes d-mp.org on the default port 64738.
What to check before committing to a server
- Version match: a server running a different KSP or DMP version than your client usually refuses the connection.
- Population: an empty server is fine for testing, but shared missions and "watch someone else's spaceplane crash" moments need other players online.
- Rules and mods: many hosts require specific mods or have build restrictions; read the server description before joining.
- Time zone: activity often clusters around the host's evening, so a server can look dead at your lunchtime and busy later.
If you want to host instead
The site describes a server download, forwarding the default DMP port 6702 on your router, and optionally installing the reporting plugin so your server appears in the Serverlist. That plugin is the difference between a private game with friends and a publicly discoverable one.
For background on the base game and its modding scene, the Kerbal Space Program site and the KSP forums are the usual reference points.
A practical first step: install the client, open the Serverlist, and sort by player count. Join the busiest server that matches your KSP version — that gives you the clearest sense of whether multiplayer KSP suits how you like to play before you invest time in hosting your own.
How does DMP handle voice chat and what Mumble settings do I need?
DMP handles voice chat by running its own Mumble server rather than building voice into the mod. You connect to it with the standard Mumble client, separate from Kerbal Space Program and separate from the DMP client. The DMP site lists the Mumble address as d-mp.org on the default port 64738, which is the port Mumble expects unless a host says otherwise.
What you need
- The Mumble client, installed on the same machine you play KSP on.
- A server address of
d-mp.organd port64738for the community Mumble server named on the DMP site. - A username of your choosing; Mumble lets you pick one on first connect and can register it with a password if the server allows registration.
- Push-to-talk set to a key you are not using in KSP, or voice activation with a sensible threshold, since KSP uses many keys and an open mic will pick up engine noise and keyboard clatter.
Practical setup notes
In Mumble's connection dialog, add a new server with address d-mp.org and port 64738. Leave the port field at 64738 if it is pre-filled. If you connect to a different DMP server than the official one, ask that server's operators for their Mumble details; the mod's own server list is about game servers, not voice servers.
Mumble's audio wizard is worth running once. It sets input and output devices and calibrates the activation threshold. For multiplayer flight, push-to-talk is usually the better choice: it keeps background noise out of other players' ears and avoids transmitting while you are concentrating on a burn.
Where voice sits in the picture
Voice chat in DMP is a convenience layered on top of the mod, not a feature the mod manages for you. The game connection and the voice connection are independent, so a Mumble drop does not end your session, and joining Mumble does not require the DMP client to be running. If you want to fly with others, install the DMP client, pick a server from the server list, and run Mumble alongside it. The official site is DMP, and Mumble itself is at Mumble.
How can I contribute to or support the DMP mod and website?
The DMP site points contributors toward a few concrete routes: running or listing a server, joining the community's voice chat, and using the site's own "Contributing" and "Support this Website" sections for whatever the project currently accepts.
Where you can actually help
Host a server. This is the most direct contribution, because a multiplayer mod is only as useful as the servers people can join. Per the site, you download the server software, forward the DMP default port (6702) in your router, and — if you want the server to appear publicly — install the DMP Reporting Server plugin so it shows up in the Serverlist. A public, listed server with sensible uptime does more for the mod than most one-off gestures.
Show up in voice. DMP runs its own Mumble server; the site says you connect to d-mp.org on the default port 64738. Being present there is how you end up helping with playtesting, bug reports and troubleshooting, which is often what small mod teams need most.
Point people at the right place. If you write about KSP multiplayer, link to DMP and Kerbal Space Program rather than mirroring downloads, so players get current client and server builds.
A quick way to decide
| What you can offer | Best fit |
|---|---|
| Spare bandwidth and a machine that stays on | Host and list a server |
| Time and patience for other players' problems | Mumble and forum support |
| Money or hosting credit | The site's support/contributing pages |
| Code, plugins or documentation | Ask the project maintainers first |
Next step
Open the site's Contributing and Support sections before you spend anything, since the accepted channels can change. If you mainly want to play rather than administer, start with the client and the Serverlist instead — and treat server hosting as the upgrade once you know you'll stick with it.
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