The Epic masterservers are currently having a few days off,
Epic and 333networks are aware of the situation and it will be resolved as soon as possible.

In the meantime if you are seeing no results in your server list, please visit 333networks to update your config.
http://333networks.com/instructions

You can contact 333networks for help via the discord or IRC

The Epic masterservers are now functioning again so the full set of results is now available.
http://333networks.com/g/all
Don't forget to add more backup masterservers to your config so you always have servers to play on.