Random MAC Address Generator Online — Free
Runs 100% in your browser — your files never leave your device.
Testing DHCP servers, spoofing scenarios in a lab, or populating fixture data — sometimes you need MACs that look real. Generate up to a hundred at a time, optionally pinning a vendor prefix like 64:16:7F, and pick your separator (:, -, ., or none) and letter case. Randomness comes from your browser's cryptographic source.
How it works
- 1
Optionally pin a prefix
Keep the first bytes fixed to mimic a specific vendor.
- 2
Pick format options
Choose the separator, letter case, and how many to generate.
- 3
Generate and copy
One click mints the batch; another copies all of it.
About this tool
What the generator produces
Random MAC addresses in valid formats, with control over the locally-administered bit — the flag that marks an address as not assigned to any real vendor. Generated addresses are for testing, not for impersonating hardware you do not own.
The testing use case
DHCP servers, MAC filtering rules, and network monitoring need test data: devices that appear and behave like real clients. Locally-administered addresses are the honest way to fabricate them — they cannot collide with genuine hardware identifiers.
Setting the locally-administered bit
The second-least-significant bit of the first octet distinguishes locally-administered addresses from registered OUIs. The generator sets it so test addresses are unambiguous about being synthetic.
Frequently asked questions
Is generating a MAC address legal?
Generating test identifiers for your own networks and software is normal practice. Spoofing a MAC to circumvent access controls or impersonate other devices on networks you do not own is not.
Will generated addresses collide with real devices?
With the locally-administered bit set, no — that range is reserved from vendor assignment, so real hardware never carries these addresses.
Can I generate addresses in bulk?
Yes — generate as many as your test environment needs, each independently random within the valid format.