Hacker News Reader

Allowing arbitrary TLD's is semantically equivalent to getting rid of TLD's (e.g. in your last example, "google" could be thought of as a TLD).

I haven't thought about it that way.

But when I try all the possible TLD's as a separate addresses, none works ( http://com , http://org , even http://xxx or http://museum , nothing works).

What is the reason... is it DNS servers that don't like this type of nslookup?

Are you sure its not the browser's own rules and not the lack of an actual website that address?

Try ending with a period.

Certainly http://dk. works. I'm sure there are others.

I don't think it's a technical issue -- I'm pretty sure I've seen a country that hosted something at the tld itself, but I can't find it now.