MAC Address Validator
Paste a MAC address in any common format — colon, dash, dot (Cisco) or plain — and get validation for 48 bit and 64 bit EUI-64 addresses, normalized output, the unicast/multicast and U/L admin bits, and the vendor OUI prefix.
Normalized formats
Address analysis
Byte breakdown
| Byte | Hex | Decimal | Binary | Role |
|---|
No vendor database is bundled, so only the OUI prefix (first 3 bytes) is shown. The bits are read from the first byte of the address.
How to use
- Paste or type a MAC address — separators are optional and mixed styles like 00-1a.2B3c:4D5E also work.
- Press Validate MAC Address to see the normalized formats, the unicast/multicast and U/L bits, and the byte table.
- Use the sample buttons to see a 48 bit and a 64 bit EUI-64 address analyzed.
Tips
- A 48 bit address has 12 hex digits (6 bytes); an EUI-64 address has 16 hex digits (8 bytes).
- The Cisco dot format groups 48 bit addresses as AABB.CCDD.EEFF and EUI-64 addresses as AABB.CCDD.EEFF.GGHH.
- Broadcast and multicast addresses start with 01, 33, or FF in the first byte.