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swagg boi's (RFC 4193 compliant) IPv6 ULA prefix spitter-outter!!

I got bored playing with html forms today and what I ended up with is this nifty form that turns a given MAC address into a /48 IPv6 ULA prefix. The form POSTs this string to a cgi script which is essentially a quick re-write of the first Perl script I ever wrote (just added some html cruft to the STDOUT). I got the idea for the first script since I couldn't find a simple way to generate an ULA from my terminal. I had to open up a browser and find other similar web-based tools with a web search but several of these didn't seem to really follow the RFC, i.e. printing out a /64 instead of a /48 or printing out the prefix with no MAC address or even a field to give it one. Maybe some wayward network nerd standing up an IPv6 lab will find this useful :)

Limit of 1,208,925,819,614,629,174,706,176 ULA addresses per customer.

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  I. Any body suspended in space will remain in space until made aware of
     its situation.
	Daffy Duck steps off a cliff, expecting further pastureland.  He
	loiters in midair, soliloquizing flippantly, until he chances to
	look down.  At this point, the familiar principle of 32 feet per
	second per second takes over.
 II. Any body in motion will tend to remain in motion until solid matter
     intervenes suddenly.
	Whether shot from a cannon or in hot pursuit on foot, cartoon
	characters are so absolute in their momentum that only a telephone
	pole or an outsize boulder retards their forward motion absolutely.
	Sir Isaac Newton called this sudden termination of motion the
	stooge's surcease.
III. Any body passing through solid matter will leave a perforation
     conforming to its perimeter.
	Also called the silhouette of passage, this phenomenon is the
	speciality of victims of directed-pressure explosions and of reckless
	cowards who are so eager to escape that they exit directly through
	the wall of a house, leaving a cookie-cutout-perfect hole.  The
	threat of skunks or matrimony often catalyzes this reaction.
		-- Esquire, "O'Donnell's Laws of Cartoon Motion", June 1980
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