I heard that each vendor is given a specific start in the Mac Address to use.
What's the problem of me creating a company and using the start of Mac Address given to google or Cisco? how is this enforced at all?
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If two devices use the same MAC address they won't function correctly on a LAN. Similar issues could happen with Bluetooth and other technologies which depend on the uniqueness guarantee of MAC addresses.
IEEE previously allocated OUI addresses in a sequential manner. Some manufacturers simply stopped paying for allocations, and began squatting on blocks they knew were unused and, under the old allocation method, wouldn't be anytime soon. IEEE saw this as problematic (for everyone, not just their revenue) and started allocating OUI addresses randomly to discourage squatting.