I see. Am I correct though that the format would be IP:port? And the ATEM just won’t let you type that in? (At home, can’t access system now to test myself)
Yeah IP:port is a pretty typical convention but there's nothing magical about it and the software has to be able to recognize it. If you try typing ":" into the ATEM Software it just doesn't let you type the ":"
if you just need a remote computer to control your studio ATEM, then running a VPN server in your studio and getting the client computer on your VPN will work great. That's a lot less involved than the full solution he was talking about.