More and more functions in ARK Survival Evolved depend on the Steam ID (for example the list of administrators). The problem is, it’s never immediately apparent what ID you need, and what format it is supposed to have. While there’s an ingame command to get the appropriate number for online players it’s quite cumbersome for more than two people, so here’s how to do it better:
Go to steamid.co. You’ll be able to enter the Steam name of the person you’re looking for there. Once you’ve done that, you’ll be able to see their information.
The ID you’re looking for looks like this: 76561197995589012
It’s important to use an ID in the same format as above, called Steam ID 64, and not one of the other ID’s. If you need bulk conversion, simply click on the User-List tab on the site and you’ll be able to provide a list of names.