I feel like you're not. When the subpoena is served, it will be to the owner of the IP with the content on it, not the owner of a random DNS entry that happens to resolve to that IP. Even if it does, I imagine the exchange going like this: "Your honor, I have no access to that server and can't control the content in any way." "Right, this is a waste of my time."
Contracts can say whatever they want. Whether or not they are actually enforceable is a whole 'nother ball game.