Any server
RCON Command Reference
Each game speaks its own console language, and no two match. This covers the same handful of jobs — see who is online, warn them, save, stop — in each game's terms, with the commands you cannot take back clearly flagged.
Connection
RCON, TCP 25575
Commands are sent without the leading slash.
Players
listWho is online, and the player cap.
kick <player> [reason]Disconnect someone. They can rejoin immediately.
ban <player> [reason]Ban by name. Survives a name change only if the server resolves it to a UUID.
ban-ip <address>No undoBan an address. Careful behind shared connections.
pardon <player>Lift a ban.
op <player>No undoGrant operator. Level comes from op-permission-level.
deop <player>Remove operator.
whitelist add <player>Add to whitelist.json.
whitelist remove <player>Remove from whitelist.json.
whitelist reloadRe-read whitelist.json after editing it by hand.
World
save-allFlush every loaded chunk to disk. Returns when finished.
save-offNo undoStop autosaving — for taking a filesystem snapshot.
save-onResume autosaving. Never leave a server with save-off.
time set dayAlso accepts night, noon, midnight or a tick number.
weather clear [duration]Also rain and thunder.
difficulty <peaceful|easy|normal|hard>Changes immediately, no restart.
gamerule <rule> <value>keepInventory, doDaylightCycle, randomTickSpeed and the rest.
seedThe world seed.
Server
say <message>Broadcast to chat.
stopNo undoSave and shut down. The server does not come back on its own.
A game only appears here once we could state its commands with certainty. RCON never asks "are you sure?", so a short reference beats a long one with a wrong command in it.
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How it works
RCON is a tiny protocol: connect, log in with a password, then send any text the server's own console would accept. The only real difference between games is vocabulary. The reference is organised by task, not alphabetically, because what people want to know is 'how do I ban someone in this game', not 'what does banid do'.
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Common mistakes
Flagged commands are irreversible, and RCON gives no second chance: no confirmation, no preview, no undo history. A Don't Starve Together rollback or a world regeneration is final the moment it goes out. Also bear in mind that a number of these consoles use one plaintext password for authentication — keep the port behind a VPN or an SSH tunnel, and out of your port-forwarding rules entirely.