It doesn't show up in a couple of DNS checkers that I tried, and I can't find a punycode converter that does anything beyond spit out a plain X. So my guess is

It doesn't show up in a couple of DNS checkers that I tried, and I can't find a punycode converter that does anything beyond spit out a plain X. So my guess is that something in the browser normalizes it before it ever gets resolved by DNS.