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IEEE OUI Registry Lookup
Find out who made any device from its MAC address.
Paste any MAC address or OUI prefix and MAC Address Search matches it against IEEE manufacturer records in real time — no account required and nothing to install.
Why use it
Built to be the fastest way to identify a device.
Instant results
Lookups run through a lightweight server-side proxy with registry caching, so most results return in under a second.
Nothing stored
Addresses you search are forwarded to the lookup registry and back. We do not log, store, or sell what you search.
How it works
From address to manufacturer in four steps.
01
Enter an address
Type or paste any 6-byte MAC address, with or without colons, dashes, or dots.
02
We isolate the OUI
The first three bytes, the Organizationally Unique Identifier, are extracted in your browser.
03
Matched to the registry
Our proxy checks the IEEE-assigned OUI records and a public vendor database for a match.
04
Results, instantly
The manufacturer, address type, and registration details appear with nothing to install.
About MAC address data
A MAC address only identifies hardware, not a person. The first three bytes (the OUI) are assigned by the IEEE Registration Authority to a manufacturer such as Apple, Cisco, or Samsung. The remaining three bytes are chosen by that manufacturer to make each device unique, but they carry no owner, location, or account information.
Modern phones and laptops often use a randomized, locally administered address while scanning for Wi-Fi networks to protect your privacy. Locally administered and multicast addresses are flagged automatically below, since they were never assigned to a manufacturer in the first place.
Frequently asked
Common questions about MAC address lookups.
What is a MAC address?
A MAC address is a 48-bit hardware identifier burned into a network interface, such as a Wi-Fi card or Ethernet port. It is written as six pairs of hex digits, for example AC:DE:48:00:11:22, and is used to address devices on a local network segment.
What is an OUI and how does it relate to a MAC address?
The OUI, or Organizationally Unique Identifier, is the first three bytes of a MAC address. The IEEE Registration Authority assigns each OUI block to a specific manufacturer, which is exactly what this tool matches against to identify the vendor of a device.
Is this MAC address lookup tool free to use?
Yes. MAC Address Search is completely free with no limit on the number of lookups, no advertising paywall, and no premium tier.
Why does the lookup sometimes show no vendor or say the address is private?
Some devices use randomized or locally administered addresses for privacy, particularly modern phones scanning for Wi-Fi. These addresses have no registered manufacturer by design, which this tool detects directly from the address bits before it even queries the registry.
Can a MAC address reveal my exact device or location?
A MAC address only reveals the manufacturer of the network hardware, such as Apple or Samsung, not a specific device, owner, or physical location. It has no connection to GPS coordinates or personal identity.
Have a MAC address handy?
Jump back to the search bar and see the manufacturer in seconds.