Random MAC Address Generator

Generate MAC Addresses in Bulk, in the Format You Actually Need

Testing network configs, seeding a device inventory database, or writing docs that need example hardware addresses — whatever the reason, you don't want to hand-type hex pairs. This generates as many random MAC addresses as you need at once, in whatever separator style your tool expects (colon, hyphen, Cisco-style dots, or no separator at all), with proper control over the unicast/multicast and universal/local bits so the addresses behave the way real network hardware expects.

How to use it

• Set how many addresses you need (up to 500 at once) and pick your format — colon-separated is standard on Linux/macOS, hyphens are common on Windows, and Cisco IOS uses the dotted format.
• Leave "Locally administered" checked (the default) so the generated addresses can never collide with a real device's factory-assigned MAC — this is the standard convention for test/virtual MACs.
• Check "Multicast" only if you specifically need a multicast/group address rather than a normal unicast one.
• Optionally lock in a real or made-up 3-byte OUI prefix (the first half of a MAC, which normally identifies the vendor) if you want every generated address to share the same manufacturer block.
• Copy the whole list or download it as a text file.

Real-world use cases

Populating a test database or mock API with realistic-looking device records without exposing any real hardware identifiers. Configuring a lab of virtual machines or containers that each need a unique, non-conflicting MAC address on a virtual switch. Writing network documentation or a tutorial that needs example MAC addresses that obviously aren't real, production hardware.

Frequently asked questions

What's the difference between a locally administered and universally administered MAC address?

A universally administered address has its OUI (first 3 bytes) assigned by the IEEE to a specific hardware vendor, so it's globally unique to a real manufacturer. A locally administered address has a special bit set that marks it as manually assigned, which is exactly why it's the safe default for generated or virtual addresses — it can't collide with real vendor hardware.

What is a multicast MAC address used for?

A multicast address is meant to be received by a group of devices rather than one specific machine — protocols like STP, OSPF, and IPv6 neighbor discovery use reserved multicast MAC ranges. Most everyday generated addresses should be unicast (the default here) unless you're specifically testing multicast behavior.

Can I generate a MAC address for a specific vendor?

Yes — enter that vendor's real OUI (the first 3 bytes of MAC addresses they're assigned) in the prefix field, and every generated address will start with it while the remaining 3 bytes stay random.

Are these MAC addresses safe to use for testing?

Yes, when left as locally administered (the default). That bit tells any network stack the address was manually assigned rather than burned into real hardware, which is the standard, collision-safe way to generate MACs for VMs, containers, and test environments.