Parked Domain Landing Pages.

Hi guys,

I am wanting to Park my own domains and do it quickly. I am not sure Domain Mapping is the way to go but it might be.
if you look at: its just a Parked Domain for sale. I want to do the same. Upon looking at the source code, its a Wordpress site located at:
If I had 10 domains as an example, It would look something like this: where '' is the parked domain.

My question is, to get like this using Wordpress, how have they done it? Or how can I do something similar quickly?
Is there a plugin for this?