MAC Address Validator
Check a MAC address and convert it to any format.
| Input | Valid? | Formatted | Details |
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How it works
A MAC address is 6 bytes (48 bits). The first 3 bytes are the manufacturer's OUI. Two bits of the first byte matter: the least significant bit marks multicast addresses, and the next one marks locally administered (randomized) addresses — phones use random MACs on Wi-Fi for privacy. The EUI-64 form is used to build IPv6 link-local addresses.