Host-request from your HTTP-headers:
idn.ter.dk

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For http://æøå.idn.ter.dk/ :

1.  Mozilla requests "xn--5cab8c.idn.ter.dk", which follows the IDN-standard.

1b. Choose "View source", and Mozilla (<= v1.7) requests "%c3%a6%c3%b8%c3%a5.idn.ter.dk",
    which is an URL-encoded version of "æøå.idn.ter.dk" - which again is a
    UTF8-encoded version of "æøå.idn.ter.dk"!

2.  Internet Explorer - without IDN-plugin - requests "æøå.idn.ter.dk".

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Your HTTP-headers:

GET / HTTP/1.1
x-cc-id: ccc01-02
Host: idn.ter.dk
User-Agent: CCBot/1.0 (+http://www.commoncrawl.org/bot.html)
Accept: text/html,application/xhtml+xml,text/xml;q=0.9,text/plain;q=0.8,image/png,*/*;q=0.5
Accept-Language: en-us,en;q=0.5
Accept-Encoding: gzip
Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
Connection: close
Cache-Control: no-cache
Pragma: no-cache