Identify device vendor from MAC address
MAC Lookup identifies the hardware manufacturer behind any MAC address by matching its first 24 bits against the IEEE OUI (Organizationally Unique Identifier) registry. Paste an address in any common format — colon-separated (00:1A:2B:3C:4D:5E), hyphenated (00-1A-2B-3C-4D-5E), Cisco dotted (001a.2b3c.4d5e), or bare hex (001A2B3C4D5E) — and the tool returns the assigned vendor along with the matched OUI prefix.
Network administrators, help-desk staff, and security analysts use it to attribute unknown devices seen in ARP tables, DHCP leases, Wi-Fi scans, or switch MAC-address tables. It is handy for spotting rogue hardware, labelling inventory, or confirming whether a device is a Cisco switch, an Apple phone, a Raspberry Pi, or a virtualization NIC before you dig further.
A MAC address is 48 bits (6 bytes) written as 12 hexadecimal digits. The first 24 bits form the OUI, which the IEEE assigns to a manufacturer, and the last 24 bits are chosen by that manufacturer to make each interface unique. For example, in 00:1A:2B:3C:4D:5E the OUI is 00:1A:2B; the tool looks that prefix up in the registry to return the vendor.
Two bits in the first octet carry meaning. The least-significant bit (bit 0) is the I/G bit: 0 means unicast, 1 means multicast. The next bit (bit 1) is the U/L bit: 0 means the address is universally administered (globally unique, vendor-assigned) and 1 means locally administered. Randomized MAC addresses used for Wi-Fi privacy on modern phones set the U/L bit to 1, so they will not match any vendor — this is expected, not an error.
Note that IEEE also issues smaller MA-M (28-bit) and MA-S (36-bit) blocks, so several vendors can share the same 24-bit prefix. The tool reports the best available match from the OUI (MA-L) registry.
Yes, it is completely free with no sign-up. A MAC lookup only compares the address prefix against a public vendor registry, so no personal or account data is involved.
Colon-separated (00:1A:2B:3C:4D:5E), hyphen-separated (00-1A-2B-3C-4D-5E), Cisco dotted notation (001a.2b3c.4d5e), and unformatted hex (001A2B3C4D5E) all work. Case is ignored.
It is most likely a randomized or locally administered address. If the second-least-significant bit of the first octet is set (for example the first octet is 02, 06, 0A, or 0E), the address was not assigned by a manufacturer and has no registered OUI.
Yes. MAC addresses can be changed in software on most operating systems, so vendor attribution is a strong hint but not proof of a device's true hardware. Treat it as one signal in an investigation.
No. The registry only maps the OUI to the manufacturer that bought the block. It does not reveal the model, serial number, owner, or physical location of the device.
A single 24-bit OUI (MA-L) block covers up to 16,777,216 addresses, so millions of devices from one vendor share the same prefix and resolve to the same company name.
Results are based on the IEEE OUI registry, which the IEEE updates regularly as new blocks are assigned. Very recently registered prefixes may occasionally not resolve yet.