Are generated MAC addresses real / tied to actual devices?
No — randomly generated for testing, won't return a match in a vendor lookup unless it happens to collide with a real registered prefix.
MAC Address Generator
Configuration
Generated MAC addresses
Generate to see MAC addresses here.
About this MAC Address Generator
Generate random MAC addresses locally, with control over the vendor OUI prefix and the unicast/multicast and universal/local administration bits.
Addresses are generated locally using the Web Crypto API. Nothing is uploaded or stored.
FAQ
Can I set a specific vendor prefix (OUI)?
Yes — type a vendor name (Apple, Cisco, VMware, and others from the same database as MAC Address Lookup) into the Vendor OUI search box and pick a match to fix its OUI as the first 3 bytes; the remaining 3 stay random for each address you generate. With a vendor picked, the Address Type and Administration controls lock to that vendor's real bits instead of the manual toggles, since overriding them would corrupt the prefix — clear the selection to go back to a fully random address.
What output formats are available?
Colon- or hyphen-separated, or Cisco dot notation (aabb.ccdd.eeff) — in upper- or lowercase.
How many can I generate at once?
Up to 50 — pick 1, 5, 10, 20, or 50.
What's a locally administered vs universally administered address?
The second bit of the first byte flags this — universal addresses use a real IEEE-assigned OUI; local ones are self-assigned and won't map to any vendor. Picking a vendor prefix locks this control, because the prefix already fixes that bit: almost every IEEE block reads Universal, but 18 of the 40,020 registered OUIs are historical assignments that carry the local bit anyway (DEC's AA:00:00–AA:00:04, 3Com's 02:C0:8C, and a handful of other 1980s registrations), and those lock it to Local. The self-assigned ranges some tools mint for virtual interfaces — Docker's 02:42:AC, QEMU/KVM's 52:54:00 — are not IEEE registrations at all, so they are not in the picker; choose Local with no vendor prefix to generate that kind.
Is the generated list sent anywhere?
No, entirely client-side.
Related tools
MAC Address LookupFind the manufacturer behind a MAC address's OUI prefix, search which OUI blocks a vendor holds, or batch-lookup many addresses at once.IPv4 Subnet CalculatorCalculate network/broadcast addresses, host ranges, and VLSM splits from a CIDR block.IPv6 ULA GeneratorGenerate RFC 4193 Unique Local Address /48 prefixes from a random or MAC-based SHA-1 Global ID, and list their /64 subnets.UUID GeneratorGenerate one or more UUID v4 values.