Which networks are specializing in ads targeted at the german language markets?
Madvertise is a good one
Yes, Madvertise is the big one - you should get good fill rates in Germany with this network.
I have been testing Madvertise on my testing device, among others. Fillrate is good, but I am missing diversity of ads. I don’t think it makes sense, to display the same ad over and over again. Either a user clicks in the first 3 impressions or he never will.