k.oгgtest
Firefox turns it into this:
http://www.k.xn--ogtest-pof/
What kind of sorcery is this?
That's no sorcery, but
IDNA encoding.
The following cyrillic letter is the cause of that:
г
This is quite frequently used by phishing sites to deceive others into clicking on a 'known' URL.
That's a known problem with unicode domain names.