MAC Address Lookup (Vendor Finder) — Free
Runs 100% in your browser — your files never leave your device.
A MAC address on your network tells you who built the device before you ever find it. Paste an address in any common format (20:37:06:12:34:56, dashes, or dots) and get the registered vendor with its address details from the IEEE OUI database. The registry loads once into your browser; the lookup itself never leaves your device.
How it works
- 1
Paste a MAC address
Colon, dash, dot, or no separators — all formats parse.
- 2
Look up the vendor
The first three bytes are matched against the IEEE OUI registry.
- 3
Copy the vendor info
Manufacturer name and registered address are ready to copy.
About this tool
What a MAC address reveals
The first half of a MAC address is an OUI — a manufacturer identifier registered with IEEE. The lookup maps it to the vendor: the card maker, not necessarily the device maker, but enough to identify "this is an Apple device" or "this is a Raspberry Pi" on your network.
The network-inventory use case
Unknown devices on a network, DHCP reservations, and access control by hardware all start from MAC lookups. Combined with the assigned IP from your router, the vendor identifies what a device probably is before you investigate further.
The privacy caveats
Modern devices randomize MAC addresses per network for privacy — the lookup reflects the registered vendor of the address shown, which for randomized addresses is a locally-administered block, not a vendor. Wired and older devices still present real OUIs.
Frequently asked questions
Why does my iPhone show a random vendor?
Private Wi-Fi addresses — Apple randomizes the MAC per network for tracking resistance. Disable private addressing for that network to see the real OUI, or accept that the lookup cannot identify it.
Can I look up a device from its MAC alone?
The vendor, yes. The specific device model is not in the OUI — combine with other signals (open ports, hostname) for identification.
What formats does the lookup accept?
Colon, hyphen, and dot-separated MAC forms all parse — the tool normalizes to the IEEE lookup form.