MAC Address Validator
Validate MAC address format, detect unicast/multicast and local/universal bits, and look up the vendor (OUI).
Enter a MAC address above to validate
We'll check format, length, address type, and vendor
What we check
Format Check
Validating MAC address notation (colon, dash, or dot format)
Length Verification
Verifying 48-bit (6-byte) address length
Unicast / Multicast
Detecting unicast or multicast address from LSB of first octet
Local / Universal
Detecting locally administered or universally administered address
Vendor Lookup (OUI)
Looking up manufacturer from the OUI (first 3 bytes)
Learn More
Learn about MAC address formats, validation rules, and how to identify device manufacturers via OUI lookup.
What Is a MAC Address?
A MAC (Media Access Control) address is a unique hardware identifier assigned to every network interface controller (NIC). Every device that connects to a network — whether via Ethernet, Wi-Fi, or Bluetooth — has at least one MAC address that distinguishes it from all other devices on the local network segment.