MAC Address Generator
Generate random locally administered MAC addresses in colon, hyphen or Cisco format. Bulk output, upper or lowercase, copy or download. Free.
About the MAC Address Generator
This MAC address generator creates random, valid MAC addresses for testing, virtual machines, network labs and MAC randomization. Choose how many you need, the separator style and the letter case, and get a clean list you can copy or download in seconds.
By default it sets the locally administered bit and clears the multicast bit, so every address is a unicast, private-use MAC that can never collide with a real manufacturer's hardware (OUI). That's exactly what you want for VMs, containers and test devices — the second hex digit will always be 2, 6, A or E, the ranges reserved for local administration.
Output supports the three formats you'll actually paste somewhere: colon-separated (aa:bb:cc:dd:ee:ff), hyphen-separated, and Cisco's dotted triplets (aabb.ccdd.eeff), plus a no-separator option. Addresses use the browser's cryptographic random generator and everything runs locally.
How to Use the MAC Address Generator
- 1Choose how many MAC addresses to generate.
- 2Pick the format (colons, hyphens, Cisco or none) and letter case.
- 3Keep 'Locally administered' ticked to avoid clashing with real hardware.
- 4Click Generate, then copy or download the list.
Frequently Asked Questions
What is a locally administered MAC address?
It's a MAC whose second-least-significant bit of the first octet is set, marking it as assigned by a local administrator rather than baked in by a manufacturer. These addresses are reserved for private use, so they never collide with real vendor OUIs — ideal for VMs and testing.
Are the generated addresses safe to use on a real network?
Yes, for locally administered use. Because the addresses fall in the private-use range and are unicast, they behave like any assigned MAC on a LAN. Just make sure two devices on the same network don't share the same address.
What's the difference between the format options?
Colon and hyphen formats (aa:bb:cc:dd:ee:ff / aa-bb-cc-dd-ee-ff) are the common IEEE styles used by Linux, Windows and most tools. The Cisco format groups the six bytes into three dot-separated pairs (aabb.ccdd.eeff), which is what Cisco IOS displays.
Are these truly random?
The address bytes come from crypto.getRandomValues, the browser's cryptographically secure random source, so the results are unpredictable. Generation happens entirely on your device with nothing sent to a server.