MAC Vendor (OUI) Lookup
Format any MAC address and read the properties encoded in it.
System verdict
RESULT00:1A:2B:3C:4D:5E — universally administered unicast
The address is universally administered, so its first three bytes are a real IEEE vendor prefix. Look it up in the vendor tool to name the manufacturer.
- Colon notation
- 00:1A:2B:3C:4D:5E
- Hyphen notation
- 00-1A-2B-3C-4D-5E
- Cisco notation
- 001a.2b3c.4d5e
- OUI (vendor prefix)The first three bytes, assigned to a manufacturer by the IEEE
- 00:1A:2B
- AdministrationBurned in by the manufacturer
- Universally administered
- Cast
- Unicast
What this cannot tell you
- Reads the properties encoded in the address itself. It does NOT name the manufacturer — that needs the IEEE vendor database, which the vendor-lookup tool carries separately.
- A locally-administered address has no real vendor behind it, so its prefix identifies nothing.
How this calculation works
A MAC address is six bytes. The first byte carries two meaningful bits — one says whether the address was assigned by a manufacturer or by software, the other whether it is unicast or multicast — and the first three bytes are the vendor prefix. This tool normalises the notation and reads those properties straight from the bits.
What the results mean
- OUI (vendor prefix)
- The first three bytes, assigned to a manufacturer by the IEEE. Naming the vendor needs the IEEE database, which this tool does not include.
- Locally administered
- The address was set by software, not burned into hardware. Normal for virtual machines, containers and phones using randomised Wi-Fi addresses.
- Universally administered
- A real hardware address with a genuine vendor prefix.
- Multicast
- Addressed to a group of devices rather than one. A unicast address targets a single device.
Frequently asked questions
Why does my phone show a random MAC?
Modern phones use a different, randomly generated MAC for each Wi-Fi network to stop networks tracking you across locations. These are locally administered, which this tool will show — and their vendor prefix is meaningless by design.
Can you tell me the manufacturer?
Not from this tool. The vendor prefix shown here is real, but turning it into a company name needs the IEEE OUI registry. Use the MAC vendor lookup tool for that.