MAC Address troubleshooting (unicast, broadcast, multicast)

gistfile1.txt

To validate that any MAC address is unicast, simply confirm that the second character of the mac address (ie, the second character of the first octet, specifically speaking) is one of 0,2,4,8,A,C,E

for example
02:00:00:00:00
04:00:00:00:00
0A:00:00:00:00
0E:00:00:00:00
E2:00:00:00:00
F2:00:00:00:00
F2:00:00:00:00
those are all unicast

while
00:00:00:00:00
01:00:00:00:00
03:00:00:00:00
05:00:00:00:00
07:00:00:00:00
E1:00:00:00:00
F0:00:00:00:00
F9:00:00:00:00
FB:00:00:00:00
these are not unicast


References:
https://www.youtube.com/watch?app=desktop&v=1HQLst2mF50
https://github.com/proxmox/pve-common/blob/master/src/PVE/JSONSchema.pm
https://www.rapidtables.com/convert/number/hex-to-binary.html?x=00