Rust Map Seeds
A seed is the single number that decides the entire shape of a Rust world. Here's what it does, how to set one, and why the same seed looks different on different servers.
What is a seed?
A seed is a whole number that feeds Rust's map generator. Together with the world size, it produces a completely deterministic world — the same island outline, the same monuments in the same places, the same roads and rivers, every single time. Give two servers the same seed and size and they'll generate an identical map.
That determinism is the whole reason seeds get shared: find one you like and anyone can reproduce it exactly. A seed can be anything from 1 to 2,147,483,647.
How to set a map seed
The seed is a server launch parameter, set alongside the size:
+server.seed 1337 +server.worldsize 4000
Leave the seed unset and the server generates a random one. Because seed and size are a pair, you have to quote both to reproduce a map — the same seed at a different size is a different world.
Seeds and wipes
Most servers change their seed at the monthly force wipe, so a seed is worth knowing for the current wipe rather than forever. If you're hunting a specific layout — every monument present, an island start, a particular Oil Rig position — you're looking for the seed a server is running this wipe, which admins usually post in their Discord.
Frequently Asked Questions
What is a Rust map seed?expand_more
A whole number that, together with the world size, generates a deterministic world — the same island, monuments, roads and rivers every time. Seeds range from 1 to 2,147,483,647.
How do I set a map seed?expand_more
Add +server.seed <number> to your server's launch options, paired with +server.worldsize. Leave it out and the server picks a random seed.
Why does the same seed look different on another server?expand_more
Almost always because the world size differs. A seed only reproduces a map at the same size; change the size and it's a different world. The game version matters too — worldgen changes between updates.
Where do I find a server's seed?expand_more
Admins usually post the current seed and size in their Discord or server description. It's only valid for the current wipe, since most servers reseed each month.
Related guides
Set up your own Rust dedicated server with SteamCMD, server.cfg, a start.bat, Oxide plugins, admin, and port forwarding. Plus honest self-host vs host tips
A Rust monument tier list ranked from beginner-safe to end-game: radiation levels, keycard puzzles, recyclers, and the gear you need for each.