Well, the second part is already mentioned in several topics, many people cannot have people connect to there servers because of some problem with the IP.
But that's not my main problem in this topic.
Ever since I un-installed and reinstalled blockland in an attempt to regain control over people being able to connect to my server, I don't have hostnames anymore. I mean this by there are still the button you can click to line the host names up alphabetically, however I cannot see the names directly, dunno what the problem is.