MAC Address Vendor Lookup
Look up a MAC address's vendor and its registered IEEE address and country, or search the OUI registry by company name for up to 50 matching prefixes.
The IEEE OUI registry ships with the page and is fetched a slice at a time as you look things up.
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.
The registrant's full record
Under Vendor the page also shows the company's entry in the IEEE registry: the Address lines as the registry lists them and, when the registry gives one, the Country, named in the language of this page with its code beside it — United States (US). A prefix registered with no address, such as a private block, says so: “The IEEE registry lists no address for this prefix.” Copy record copies the company name and its address together, one line each, as the registry lists them.
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. The addresses are a second set of pieces, kept apart from the names and fetched only once a vendor is on screen, so a name search does not download them. If a piece cannot be fetched — the connection is down and that piece was not loaded before — the page says the IEEE registry could not be loaded instead of leaving the answer blank.
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.
Where does the address come from, and what does it tell me?
It is the address the organisation holding the prefix gave the IEEE, as the IEEE's public OUI registry lists it: the street and city lines under Address, and, when the registry gives one, the Country, named in the language of this page with its code beside it. It tells you who registered the block, not where a particular device was made or bought. The addresses are fetched from this site only once a vendor is on screen, and Copy record copies the company name together with its address lines.