MAC Address Generator

Generate random MAC addresses in bulk from a quantity and optional vendor prefix — useful for testing, documentation, or populating placeholder network configuration data.

A MAC address is a 12-character hexadecimal identifier tied to a network interface, and generating realistic-looking sample ones is a common need when testing network configuration tools, documenting a setup, or seeding placeholder data that shouldn’t correspond to any real device.

Set how many addresses to generate, and optionally specify a vendor prefix (the first three byte pairs, sometimes called the OUI, which real-world addresses use to identify the manufacturer) if you want the generated addresses to resemble a specific vendor’s real numbering pattern. Choose your preferred separator style (colon or hyphen) and case (upper or lower), and generate the full batch instantly.

Frequently asked questions

Could a generated address accidentally match a real device’s actual MAC address?

It’s extremely unlikely given the size of the address space, but since these are randomly generated rather than officially registered, there’s no guarantee of real-world uniqueness the way an actual assigned MAC address has — treat generated addresses as suitable for testing and placeholder purposes, not as officially reserved identifiers.

What does the vendor prefix actually represent?

The first three byte pairs of a real MAC address (the OUI) are officially assigned to a specific hardware manufacturer, so including a realistic vendor prefix makes generated test data look more like it came from a specific brand of device, which can matter for certain testing or documentation scenarios.

Can I generate addresses in a locally-administered format specifically, rather than a vendor-style one?

Yes, toggle the locally-administered bit setting to generate addresses following that specific convention, commonly used for virtual machines and software-defined network interfaces rather than mimicking a physical hardware vendor.