Find the vendor and manufacturer of a device by its MAC address.
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About MAC address lookup
Identifies the manufacturer of a network device from the first 24 bits (OUI) of its MAC address, using a bundled table of common vendor prefixes, so the lookup works offline. It accepts colon, hyphen, Cisco dot and bare hex formats, shows the address in each format plus decimal and its modified EUI-64 link-local IPv6 address, and decodes the unicast/multicast and universal/local bits of the first octet. The table is a curated subset of the IEEE registry, so rare vendors may show as unknown.
Common uses
- Identify an unknown device on your network from its MAC address
- Normalize MAC addresses from different tools into one format
- Check whether a MAC is randomized (locally administered)
- Derive the fe80:: link-local address a device builds from its MAC
FAQ
- What is an OUI?
- An Organizationally Unique Identifier is the first 3 bytes (24 bits) of a MAC address, assigned by the IEEE to a manufacturer. The remaining 3 bytes are chosen by that manufacturer.
- Why does my phone's MAC address show no vendor?
- Modern phones and laptops use randomized MAC addresses for privacy. These have the locally administered bit (the second-lowest bit of the first octet) set and do not belong to any vendor.
- How can I tell if a MAC address is multicast?
- If the lowest bit of the first octet is 1, the address is multicast; for example 01:00:5e:... is used for IPv4 multicast. FF:FF:FF:FF:FF:FF is the broadcast address.