5 ms·

So they registered the domain "www" just like they could have registered "google" or "lol". You can access Google by typing: - google.com (domain name) - www

So they registered the domain "www" just like they could have registered "google" or "lol". You can access Google by typing: - google.com (domain name) - www.google.com (subdomain) The same for the domain in question: - www.ai (domain name) - www.www.ai (subdomain) ~~The reason why typing ".ai" or "ai", etc. In your browser works is in IMO due to the internals of the browser that automatically adds a www in front of the domain if it can't resolve it because historically so many websites run on http://www.example.com http://www.example.com and neglect to setup http://example.com~~ http://example.com~~ Edit: as pointed by another comment (https://news.ycombinator.com/item?id=31690379 https://news.ycombinator.com/item?id=31690379) there are actually TLDs with A records which is the case here. So to take my example from above: The registry responsible for the AI TLD set up a website on the domain name "www.ai" but neglected to set it up on the subdomain "www.www.ai" Instead, they set it up on the TLD "ai" which is indeed very unusual.

LeoPanthera 4y ago
This is not correct. The TLD alone is a valid domain name, although in most cases it must be followed by a trailing dot. "ai." is valid, "ai" may not be.
- jmprspret 4y ago
  I thought 'ai' was valid according to spec, but depending on your browser it may or may not actually go to 'http://ai./ http://ai./'
- iRomain 4y ago
  It is a valid domain in the technical DNS sense. But practically speaking, each TLD has "ns" entries in the root zone database, not "A", "CNAME", etc. entries. This is just a guy who registered www under a TLD that's it.
  - LeoPanthera 4y ago
    This has nothing to do with the "www" subdomain. I assure you that the unix "host" tool is not trying to guess subdomains if the lookup fails: $ host "ai." ai has address 209.59.119.34 ai mail is handled by 10 mail.offshore.ai.
    - iRomain 4y ago
      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 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"?
      - LeoPanthera 4y ago
        They are the same, but that's not really the point. www has been registered in addition to the entries for the root TLD. You said "the internals of the browser that automatically adds a www in front" - that's irrelevant. host isn't doing that, curl isn't doing that.
        iRomain 4y ago
        You are right, they added a A record in the root zone file. I didn't know it was allowed. https://news.ycombinator.com/item?id=31690379 https://news.ycombinator.com/item?id=31690379
        5ESS 4y ago
        Did the owners of .com do the same thing? Because http://com http://com. Works as well.
  - captn3m0 4y ago
    There's a bunch of TLDs with A records, even Google used to point .dev to 127.0.0.53 for a while.
    - iRomain 4y ago
      You are right I didn't know it was allowed

LeoPanthera 4y ago

This is not correct. The TLD alone is a valid domain name, although in most cases it must be followed by a trailing dot. "ai." is valid, "ai" may not be.

jmprspret 4y ago
I thought 'ai' was valid according to spec, but depending on your browser it may or may not actually go to 'http://ai./ http://ai./'
iRomain 4y ago
It is a valid domain in the technical DNS sense. But practically speaking, each TLD has "ns" entries in the root zone database, not "A", "CNAME", etc. entries. This is just a guy who registered www under a TLD that's it.
- LeoPanthera 4y ago
  This has nothing to do with the "www" subdomain. I assure you that the unix "host" tool is not trying to guess subdomains if the lookup fails: $ host "ai." ai has address 209.59.119.34 ai mail is handled by 10 mail.offshore.ai.
  - iRomain 4y ago
    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 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"?
    - LeoPanthera 4y ago
      They are the same, but that's not really the point. www has been registered in addition to the entries for the root TLD. You said "the internals of the browser that automatically adds a www in front" - that's irrelevant. host isn't doing that, curl isn't doing that.
      - iRomain 4y ago
        You are right, they added a A record in the root zone file. I didn't know it was allowed. https://news.ycombinator.com/item?id=31690379 https://news.ycombinator.com/item?id=31690379
      - 5ESS 4y ago
        Did the owners of .com do the same thing? Because http://com http://com. Works as well.
- captn3m0 4y ago
  There's a bunch of TLDs with A records, even Google used to point .dev to 127.0.0.53 for a while.
  - iRomain 4y ago
    You are right I didn't know it was allowed