HTTP: //AI
Fun fact: the .ai TLD (http://ai) works by itself, although Hacker News (and probably lots of other things) won't accept it as a valid URL.
Turns out they are prohibited for new gTLDs. https://www.icann.org/en/announcements/details/new-gtld-dotl...
Also: http://ai./ works (at least in Safari)
http://ai doesn't open in a browser for me, while http://offshore.ai/ does work.