Invalid MAC Address Format SYNTAX ERROR

The MAC address c4:67:b5) has a bad format. Enter at least 6 hexadecimal digits (0–9, A–F). You can search using a MAC address or an assignment prefix, including 7-digit MA-M and 9-digit MA-S prefixes.

Try Another Lookup

Accepted MAC & OUI Formats

IEEE 802 Standards
Standard Colon
Standard IEEE 802.3 format
00:1A:2B:3C:4D:5E →
Hyphen Delimited
Windows / Intel format
00-1A-2B-3C-4D-5E →
Cisco Hextet
Cisco IOS triple dotted format
001A.2B3C.4D5E →
Raw Hex (12 char)
Continuous hex string
001A2B3C4D5E →
24-bit OUI Prefix
Vendor prefix query (3 octets)
00:1A:2B →

Common Syntax Pitfalls

  • × Non-hexadecimal characters: MAC addresses only allow numbers 0-9 and letters A-F (letters G-Z are invalid).
  • × Incorrect length: At least 6 hexadecimal digits are required, excluding separators.
  • ✓ Supported separators: ":", "-", ".", " " can be used in any combination.
Need synthetic test addresses?

Generate valid, standards-compliant random MAC addresses with custom prefixes and delimiters using our online generator.

Open MAC Generator →