MAC Address Lookup
Find the manufacturer of any MAC address from the IEEE OUI registry, see the registered block and company address, and learn whether the address is randomised, locally administered or multicast.
What a MAC address tells you
Every network interface has a hardware address of six bytes. The first three, the OUI, are assigned by the IEEE to a manufacturer, so the address reveals who built the chip or device: Apple, Intel, Samsung, a Raspberry Pi, a Sonos speaker. The remaining bytes are chosen by the vendor.
Enter a full address or just the first six hex digits. Any notation works: colons, dashes, dots or nothing at all.
Randomised and local addresses
- Randomised: iOS, Android, Windows and macOS use a random address per Wi-Fi network for privacy. These have the locally administered bit set and match no vendor. Seeing one in your router's client list is normal.
- Locally administered: set by software rather than burned in, used by virtual machines, containers, some VPN adapters and randomised addresses.
- Multicast: the lowest bit of the first byte is set. These are group addresses, never a single device.
When it's useful
- Identifying unknown devices in a DHCP lease list or Wi-Fi client table.
- Checking whether a rogue device is a phone, a printer or an embedded board.
- Building vendor-based rules for network access control.
Questions
Why is no vendor found?
The address is probably randomised, the tool shows that flag. Otherwise the block may be very new or belong to a small assignment that the registry lists under a longer prefix.
Can I find the owner of a device by MAC?
No. The address identifies the manufacturer only. There is no public registry linking addresses to people.
What is the difference between MA-L, MA-M and MA-S?
Block sizes in the IEEE registry. MA-L is the classic 24-bit OUI with 16 million addresses, MA-M is 28 bits, MA-S is 36 bits for small manufacturers.