MAC Address Generator
Generate a random, locally-administered MAC address in colon-separated format — safe for network testing, guaranteed never to collide with a real vendor OUI.
🔒 100% Client-Side Processing
Your data is processed entirely in your browser and never transmitted to any server.
Common Use Cases
Network test fixtures
Fill DHCP simulations, inventory databases, and parser tests with realistic hardware addresses.
Documentation examples
Use generated MACs in guides and screenshots instead of exposing real device addresses.
Frequently Asked Questions
- What format is the generated MAC address?
- Six colon-separated pairs of uppercase hex digits, like 3A:7F:1C:B2:9E:04 — the standard IEEE 802 notation used by network interfaces, DHCP reservations, and MAC filtering rules.
- Could a generated MAC collide with real hardware?
- No — the generator sets the locally-administered bit (the second-least-significant bit of the first octet) on every address, per the IEEE 802 standard. That bit is reserved for addresses assigned outside the normal vendor OUI process, so a generated MAC can never coincide with a real, globally-assigned hardware address.
- Are these addresses locally administered?
- Yes, deliberately. The second character of the first octet is always 2, 6, A or E, which sets the locally-administered bit and clears the multicast bit. That combination is reserved for addresses assigned by a local network rather than burned in by a manufacturer, so a generated value can never collide with a real IEEE-assigned vendor OUI.
- Can I use one of these on a real network?
- For testing, yes — locally administered addresses exist precisely for this. Two rules still apply: the address must be unique on the local segment, since a duplicate breaks switching for both machines, and changing a MAC on a network you do not control may violate its access policy.
- How do I identify the vendor behind a real MAC address?
- The first three octets are the OUI, which maps to the manufacturer. Paste a real address into the MAC Address Vendor Lookup to resolve it. Generated addresses here will not resolve to anything, which is the intended outcome.
- Is my data private when I use this tool?
- Yes. This tool runs entirely in your browser using client-side JavaScript — nothing you type is transmitted to, logged by, or stored on any server. You can safely process confidential text, tokens, or code.