Free MAC Address Generator
Generate random MAC (Media Access Control) addresses for testing, network configuration and documentation. Choose how many to create, the separator style, and whether to force a locally-administered unicast address.
MAC addresses are hardware identifiers; if you need a generic unique value the UUID Generator fits better, and the Random Token Generator covers secrets.
How to use the MAC Address
- 1 Choose how many addresses you need.
- 2 Pick the output format — colon, hyphen or dotted.
- 3 Generate the addresses, which are set as locally administered and unicast.
- 4 Copy them for your test fixtures or virtual machines.
How to Use
Set the number of addresses and the format, then click Generate. Copy a single address or the whole list.
- Generate 1 to 100 addresses at once
- Colon, hyphen, dot or no-separator formats
- Uppercase or lowercase hex
- Optionally force locally-administered unicast (2nd nibble = 2, 6, A or E)
- Uses cryptographically secure randomness
What makes a valid MAC address?
A MAC address is 48 bits (6 bytes) written in hexadecimal. The least-significant bit of the first byte flags unicast vs multicast, and the second-least-significant bit flags globally unique (OUI-assigned) vs locally administered — useful when generating addresses for virtual machines.
Frequently asked questions
What does locally administered mean?
It is a flag in the second-least-significant bit of the first octet. Setting it tells the network that this address was assigned by software rather than burned in by a manufacturer, which is the correct way to create a MAC address you intend to use on a real interface.
Why does the second character always look limited?
Because of those two flag bits. The unicast bit must be 0 and the locally-administered bit must be 1, which constrains the first octet to a small set of hex pairs — you will see 02, 06, 0A, 0E and similar rather than any value.
Can I use these on a real network?
For a lab, a VM or a container, yes — that is exactly what locally administered addresses are for. Do not clone a MAC you do not own: some networks enforce port security, and spoofing an address you have no claim to can breach a network policy.
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