The best result have the ccc server (testet with GRC dns test)
Yes the CCC are hackers but every year they show you alot of security things at the congress and in my opinion these guys are realy trustworthy.
Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:2.0) Gecko/20100101 Goanna/20160121 PaleMoon/26.0.0
Found this, maybe worth noting here?
(Disclaimer: I know nothing about the person who posted that, I don't necessarily recommend those DNS servers, and I can't confirm the accuracy of all of the information there.)