I'm not saying "ai" is not a valid domain. I'm just guessing why people get to a website when they just type "ai".
I'm on my phone now, if you search for the ai entry in the root zone file (https://www.iana.org/domains/root/files) you should find that IP returned by your host command.
Can you try curling "ai" and see if the content returned (if any) is the same as the one from "www.ai"?
I'm on my phone now, if you search for the ai entry in the root zone file (https://www.iana.org/domains/root/files) you should find that IP returned by your host command.
Can you try curling "ai" and see if the content returned (if any) is the same as the one from "www.ai"?