From Minecraft Wiki
Manages the server whitelist.
Server ops will always be able to connect when the whitelist is active, even if their names do not appear in the whitelist.
- The command has six variations.
whitelist add <player>
whitelist remove <player>
- player (
- Specifies the player(s) to add or remove from the whitelist.
- Fails if the arguments are not specified correctly, or if player doesn't exist
- On success:
add— Adds the player name to the whitelist. The player does not need to be online.
list— Displays all player names in the whitelist.
off— Disables the server's use of a whitelist.
on— Enables the server's use of a whitelist.
reload— Reloads the list of player names in
white-list.txt(1.7.5 or earlier) or
whitelist.json(1.7.6 or later) from disk (used when
whitelist.jsonhas been modified outside of Minecraft).
remove— Removes the player name from the whitelist. The player does not need to be online.