Random MAC Address Generator

Made for the task at hand.

Produce test addresses for virtual interfaces and documentation with Web Crypto randomness. Preserve up to five prefix bytes, choose formatting and quantity, and explicitly set or clear the locally administered bit while always clearing the multicast bit.

How to use

1. Choose quantity and an optional zero-to-five-byte prefix.
2. Select case, colon/plain format, and local or global scope.
3. Generate addresses and verify uniqueness or allocation needs separately.