Hi Karsten,
some time ago I reported onionoo's poor reverse DNS results https://trac.torproject.org/projects/tor/ticket/18342 and it didn't change since then.
As of 2016-07-02 08:00 (tpo instance) 3144 out of 8473 (~37%) still have no reverse DNS result (=IP address).
Do you have an idea whether this will improve sometime before 2016-09-01?
thanks, nusenu
btw: Thanks for working around the maxmind AS problem with reverting to the May version.