Network tools · MAC address

Free Online MAC Address Generator

Generate random MAC addresses with batch output, case and separator formatting, optional OUI prefix, and control over LAA (locally administered) and multicast bits. Runs locally in your browser with zero uploads.

Generate MAC Addresses

Common formats: AA:BB:CC:DD:EE:FF, AA-BB-CC-DD-EE-FF, or AABBCCDDEEFF.

Count

Separator

Letter case

Locally administered (LAA)

Multicast bit

Prefix (Optional)

Set an OUI prefix (e.g., 00:1A:2B). Remaining bytes are randomly filled. Accepts :, -, or no separators.

Result

One MAC address per line.

Bit meaning

U/L bit (2nd least significant bit of the first byte): 0 = globally unique (OUI), 1 = locally administered (LAA).
I/G bit (least significant bit of the first byte): 0 = unicast, 1 = multicast.

Tips

For VMs/containers/testing, forcing LAA and keeping unicast is usually the safest choice.
Be careful in production networks: random MACs can collide or trigger security policies.

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