"Can't resolve hostname"

I'm having a problem joining my server, it keeps saying "Can't resolve host name" they're no typos because I copied and pasted the server IP. I also looked in the command prompt and looked at "nslookup {Server IP}" and "nslookup lion.aternos.host"

Here are the screenshots:

things are blocked out (for obvious reasons)

Quote from ChosenFate

Try to change your DNS

What does it need to be? also, This is a new thing that has happened to me. Never has happened in the past.