How to set a seed on a Minecraft server

Set level-seed=-4172144997902289642 in server.properties, then create a new world. It only affects worlds generated after the change.

level-seed

Sets the seed used to generate a new world.

level-seed=<seed>

Examples

level-seed=-4172144997902289642

Use a known seed.

level-seed=

Random seed.

Arguments

seedRequired: The value to write after the equals sign.

What it does

Enter a number or text seed to generate a specific world. Empty means a random seed. It only matters when the world is created; changing it later has no effect on existing terrain.

Good to know

Only used when a new world is generated.
Use /seed to see an existing world's seed.

Run it on your server

On a SLASHPLAY server, type it in the Console tab without the leading slash; in game, operators type it in chat with the slash. New to this? Start a Minecraft server first.

Your own
Minecraft server.

Start a Minecraft server All commands

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