MAC Address Generator
Generate random, locally-administered MAC addresses with your chosen separator and case — for testing, mockups and labs. Uses your browser’s crypto API.
Verified 3-byte virtualization prefixes
| Vendor | Prefix | Use | Source |
|---|
Generate random MAC addresses
Use local-random mode for safe test addresses, or preserve a verified three-byte virtualization prefix exactly. The I/G and U/L conclusions update from the actual first octet.
FAQ
Are these real device addresses?
No. Local-random mode creates locally administered unicast addresses for testing. Exact-prefix mode preserves a selected three-byte prefix but does not assign real hardware ownership.
What format options are there?
Choose the separator (colon, hyphen or none) and upper or lower case.
What do the OUI bits mean?
The first octet's I/G bit is 0 for unicast or 1 for multicast. Its U/L bit is 1 for locally administered or 0 for globally administered. Exact-prefix mode reports those bits without changing them.
Is anything sent anywhere?
No. Generation uses your browser's secure random source.
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