MAC Address Generator

The MAC Address Generator creates random, correctly formatted 48-bit hardware addresses for testing, simulation, documentation and lab work.

A MAC address identifies a network interface, and when you need realistic-looking but fake addresses — for unit tests, network diagrams, DHCP reservations in a sandbox, or sample data — generating them by hand is tedious and error prone.

This tool produces as many as you need instantly.

By default the addresses are marked locally administered and unicast, which means the right bits in the first octet are set so the address will not collide with a real vendor OUI block.

That is the polite, standards-aware choice for synthetic addresses.

If you would rather mimic a specific vendor, supply a three-octet OUI prefix such as 00:11:22 and the first half of every address will use it while the rest stays random.

You control the presentation too: pick colon, hyphen, Cisco-style dotted, or no separator, and choose lowercase or uppercase hex.

Generate one address or a batch of up to a thousand, copy them individually or all at once, and regenerate as many times as you like.

Randomness comes from the browser Web Crypto API, and everything runs entirely on your device — nothing is sent to a server — so the tool is fast, private and works offline once loaded.