MAC Address Lookup
Paste a MAC address in any notation and get the manufacturer, the OUI prefix, whether it is unicast or multicast, and whether it is a real burned-in address or a randomised one. The lookup runs in your browser, so the address is never sent anywhere.
MAC address lookupPaste a MAC address to identify its vendor and read its bits
A randomised address is not a lookup failure. Phones and laptops rotate their MAC address per network for privacy; those addresses have the U/L bit set and belong to no vendor at all. The same bit pattern also covers a deliberately configured local address (a bonded interface, a cluster VIP, a hypervisor pool) and the bit alone cannot tell those apart. Either way there is no manufacturer to find, so this page says so instead of returning an empty vendor.
Common questions
- What is an OUI?
- The Organizationally Unique Identifier is the first 24 bits (the first three octets) of a MAC address. The IEEE Registration Authority assigns these blocks to manufacturers, so those three octets identify who made the network interface. The remaining 24 bits are chosen by the manufacturer to make each device unique within its block.
- Why does my phone's MAC address show no vendor?
- Because it is almost certainly randomised. iOS and Android generate a private MAC address per network to stop venues tracking you across visits. These have the locally-administered bit set, which means they belong to no manufacturer block at all, so the correct answer is not "vendor unknown" but "this address was generated by the device, not assigned to a vendor". The tool says so explicitly.
- How do I read the two special bits in a MAC address?
- They live in the least significant two bits of the first octet. The I/G bit distinguishes unicast (0, one recipient) from multicast (1, a group). The U/L bit distinguishes universally administered (0, assigned by the IEEE to a manufacturer) from locally administered (1, set by software or randomised). Broadcast (ff:ff:ff:ff:ff:ff) has both set, which is why it reaches everyone.
- Which MAC address notations does this accept?
- All the common ones: colon-separated (00:1b:63:84:45:e6), hyphen-separated, Cisco three-group dotted (001b.6384.45e6), and bare hex with no separators. Case does not matter and surrounding whitespace is ignored. It also accepts 64-bit EUI-64 identifiers and shows the EUI-64 derivation for 48-bit addresses.
- Can I find someone's location or identity from a MAC address?
- No. A MAC address identifies a network interface's manufacturer and nothing else. It carries no location, no owner, and no account. It is also only visible on the local network segment; routers do not forward it. The useful things it tells you are which vendor made the hardware and whether the address is randomised.
- Is the address I paste sent to a server?
- No. The vendor data ships with the page and the lookup happens locally, which is the reason this tool exists. MAC addresses harvested from a network capture are exactly the kind of data that should not be pasted into someone else's backend. Check your browser's network tab and you will see no request.
Parsing and the bit flags are exact. Vendor names come from a bundled registry snapshot, so a very recently assigned block may not resolve. The tool says when a prefix is unknown rather than guessing.