kuschku.de has, for the past 2 years, always pointed at 51.15.1.223 or 163.172.217.134, never at 204.236.227.242. Funnily, for other domains pointed at the same IPs, it has correct data – e.g. quasseldroid.info correctly shows the IP history.
The datasets used here seem of questionable quality, souring the taste of this awesome feature.