$ hexdump -n5 -e'/3 "00" 5/1 ":%02X"' /dev/random; echo
00:11:63:67:41:9D

$ hexdump -n6 -e '/1 ":%02X"' /dev/random|sed s/^://g; echo
A6:36:53:D1:A2:5F

$ dd if=/dev/urandom bs=1024 count=1 2>/dev/null 
| md5sum | sed 's/^\(..\)\(..\)\(..\)\(..\)\(..\)\(..\).*$/00:\2:\3:\4:\5:\6/'
00:5a:a8:56:b8:0d

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