Random MAC Address Generator Free Online Tool 2026

Last updated March 22, 2026

MAC Address Structure Reference

• Length: 48 bits (6 bytes / octets)
• OUI (first 3 octets): Organizationally Unique Identifier — assigned to manufacturers
• NIC (last 3 octets): Network Interface Controller — assigned by manufacturer
• Bit 0 of first octet: 0 = unicast, 1 = multicast
• Bit 1 of first octet: 0 = globally unique (OUI enforced), 1 = locally administered
• Broadcast: FF:FF:FF:FF:FF:FF (all bits set)
• For testing: Always use locally administered addresses (bit 1 = 1) to avoid conflicts

Locally administered addresses (safe for any network):
  02:4A:8B:C3:D1:E5
  06:1F:3C:7A:B2:D4
  0A:5E:2D:9F:C8:31
  0E:72:4B:A6:18:5C

How to identify locally administered addresses:
  First octet in binary: xxxxxxx1 (bit 1 set)
  First octet in binary: xxxxxx1x (bit 2 set = locally administered)

  02 = 0000 0010 → bit 1 = 0 (unicast), bit 2 = 1 (locally administered) ✓
  06 = 0000 0110 → bit 1 = 0 (unicast), bit 2 = 1 (locally administered) ✓

These addresses are guaranteed not to conflict with
real hardware addresses on your network.

Cisco Systems (OUI: 00:00:0C):
  00:00:0C:A1:B2:C3
  00:00:0C:D4:E5:F6

Apple Inc. (OUI: 00:17:F2):
  00:17:F2:12:34:56
  00:17:F2:AB:CD:EF

Intel Corporation (OUI: 00:1B:21):
  00:1B:21:78:9A:BC
  00:1B:21:DE:F0:12

Samsung Electronics (OUI: 00:07:AB):
  00:07:AB:34:56:78
  00:07:AB:9A:BC:DE

Use case: Testing network monitoring tools that display
vendor information based on MAC address OUI prefix.

Same address in different formats:

Colon-separated (Linux/macOS standard):
  02:4A:8B:C3:D1:E5

Hyphen-separated (Windows standard):
  02-4A-8B-C3-D1-E5

Cisco dot-separated:
  024A.8BC3.D1E5

Unseparated hex (for database storage):
  024A8BC3D1E5

Uppercase:
  02:4A:8B:C3:D1:E5

Lowercase:
  02:4a:8b:c3:d1:e5