Whenever I see chop, wonder if something is wrong. Not saying that it's wrong to use it here, but just saying. What about this code? 
s/[[:^xdigit:]]//g; $mac =  lc join ":", unpack "(A2)*", $_

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thor

Feel the white light, the light within
Be your own disciple, fan the sparks of will
For all of us waiting, your kingdom will come

In reply to Re: MAC Pretty-printer by thor
in thread MAC Pretty-printer by moot

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