Hello @bluebit !
Sorry for this late answer: for some reason I don’t understand, I didn’t received the notification.
Well, to answer your question, I have no idea if it’s a “legit” or malicious IP. The first search I’ve done seems indicate it’s a residential one. So, it’s strange… Are you sure it’s not yours?
Due to inactivity, I close this ticket.
Don not hesitate to reopen it if needed 😉