[Skunkworks] Crazy Re-writes

Hi good people, I'm up about the net and I come across the Unilever website. It loads on my machine as if its on a localhost i.e http://unilever/ http://unilever/innovation/ http://unilever/mediacentre/ ..and so on all load as is. I know of re-write rules but this one blew me away. Can anyone explain this? Am on an AK link, that could be a factor too. Regards