Where is my minecraft server's spawnpoint?

Question

I have a small public vanilla minecraft survival server, and I've decided to build a structure by the spawn point and increase spawn-protection within the server.properties files to prevent it from being griefed.

How can I find the exact coordinates of the centre of the spawnpoint. I understand from the minecraft wiki page, that the spawn point will be within a few hundred units away from the map origin (0,0), but as I'm only looking to protect a small area around the spawn point (say 128 blocks), I want to find the exact centre so I know where I should start building?

Alternatively, can I globally change the spawnpoint for all new players? I tried the /spawnpoint command, but despite not specifying a username, the response suggests that I've only altered my own spawnpoint. (i.e. "Set Bryan's spawnpoint to x,y,z")?

For info, I'm the server owner, and have full root shell access.

Answer 1

The exact co-ordinates of the spawn point are stored in the level.dat file. You can use an NBT editor such as NBTExplorer to find these values.

In NBTExplorer, go to File → Open... and navigate to your world folder. Open the level.dat file inside. Expand the Data entry and you'll find your SpawnX, SpawnY, and SpawnZ values, which you can then /tp to.