What is the OUI and the vendor?

The first three bytes (OUI – Organizationally Unique Identifier) identify the manufacturer of the network card. The IEEE assigns these blocks to companies; this tool looks them up in the official IEEE database.

What does "locally administered" mean?

If the U/L bit in the first byte is set, the address was assigned locally (e.g. by MAC randomisation on smartphones) and belongs to no registered vendor. In that case no OUI match is possible.

MAC Address Lookup – Find the Vendor of a MAC Address

Q: What is a MAC address?

A MAC address (Media Access Control) is a unique hardware identifier for every network interface (e.g. a Wi-Fi or LAN chip). It is 48 bits long, usually written as six hex pairs – e.g. 00:1A:2B:3C:4D:5E.

Enter a MAC address or OUI to find the vendor. The first 3 bytes are enough (e.g. 00:1A:2B). Colon, hyphen, dot or no-separator formats are supported.

My IP MAC Lookup IP Lookup ASN Lookup Subnet

What is a MAC address lookup?

Every network interface has a MAC address – a 48-bit hardware identifier assigned at the factory. The first three bytes form the OUI (Organizationally Unique Identifier) and identify the manufacturer of the network chip. The IEEE assigns these blocks to companies worldwide.

This lookup matches the OUI against the official IEEE database and shows you the corresponding vendor. It also detects whether the address is global (vendor-assigned) or locally administered – the latter happens, for example, with the MAC randomisation of modern smartphones, which use random addresses for privacy reasons.