MAC Address Vendor Lookup
Look up the hardware vendor behind any MAC address in the bundled IEEE OUI registry, or search the registry by company name. Free, in your browser, no upload.
🔒 The IEEE OUI registry ships with the page and is fetched a slice at a time as you look things up — every lookup runs in your browser and nothing is uploaded.
What a MAC address vendor lookup tells you
Every network interface — a Wi-Fi card, a Bluetooth radio, a router, a printer, a smart bulb — ships with a MAC address, and its first half is an OUI (Organizationally Unique Identifier) that the IEEE assigns to the company that made the hardware. This tool maps that OUI back to the manufacturer, so you can tell at a glance whether a device on your network is built by Apple, Cisco, Samsung, Espressif, Raspberry Pi or one of thousands of other vendors. Paste a full MAC like 00:1A:2B:3C:4D:5E, a dashed or Cisco dotted variant, or just the first six hex digits.
Search the registry by name
Type a company name instead of a MAC and the lookup runs in reverse, listing the OUI prefixes registered to vendors whose name matches, up to the first 50 — useful for writing firewall rules, spotting an unexpected device, or checking which prefixes a brand owns. One rule to know: a term spelled only with digits and the letters a–f is read as a half-typed address rather than a name, so search f5 networks rather than f5. The whole IEEE OUI registry is shipped with the site — sixteen pieces, and a lookup fetches the one it needs — so there is no lookup service to call and nothing you type ever leaves your browser.
Frequently asked questions
What is an OUI?
An OUI (Organizationally Unique Identifier) is the first 24 bits — the first six hex digits — of a MAC address. The IEEE assigns each OUI to a single manufacturer, so it identifies who made the network hardware, while the remaining digits keep each individual device unique.
Why does my MAC show no vendor, or the wrong one?
Phones and laptops often use a randomized, locally administered MAC for privacy; those are not registered to anyone and will not match a vendor. An address may also fall in an unassigned block, or show the chipset maker rather than the brand printed on the box.
Is my MAC address uploaded anywhere?
No. The registry is part of the site itself and every lookup runs in your browser with JavaScript — the page fetches the piece of the registry your address falls in, from this site, and nothing you type is sent, stored or uploaded.