How to Use the MAC Address Generator & OUI Formatter
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1
Click "Generate Random MAC" to produce a valid unicast, locally-administered MAC address.
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2
Select your preferred notation: Colon (`00:1A:2B:3C:4D:5E`), Hyphen (`00-1A-2B-3C-4D-5E`), Cisco Dot (`001a.2b3c.4d5e`), or Raw.
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3
Or paste an existing MAC to convert its casing and delimiter style.
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4
Inspect the Individual/Group (I/G) and Universally/Locally Administered (U/L) bit flags.
Practical Example & Use Case
Common Real-World Scenario
Generating 5 randomized MAC addresses for testing virtual machines on a local hypervisor network.
Technical Notes & Limitations
Browser Engine Architecture
Generates valid 48-bit EUI-48 physical hardware addresses.
Frequently Asked Questions
What bit makes a MAC address locally administered?
The second least significant bit of the first byte (U/L bit). Setting it to 1 designates the address as locally administered.