It happens that they've enabled wildcard DNS, and will serve up requests to sub domains named, well anything at all. No, really. Anything at all.

Also... a long time ago, serving up the same content on multiple subdomains named "www#" was a cheap and simple load balancing technique. Each domain would correspond to a physical server. It fell out of common practice with the advent of sane reverse proxies and simplified virtual hosting technologies.

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