How to identify a device from a MAC address
Combine an IEEE vendor result with switch, DHCP, Wi-Fi and asset information to narrow down an unknown device without overstating what an OUI proves.
MAC Address and OUI Guides
Practical explanations for interpreting MAC addresses and using vendor data responsibly.
OUI, MA-L, MA-M and MA-S explained
Learn why assignments can be 24, 28 or 36 bits long, and why longest-prefix matching produces a more precise result.
Locally administered versus multicast addresses
Decode the U/L and I/G bits in the first octet and understand randomised Wi-Fi, virtual interfaces and multicast addresses.
MAC lookups from switch, ARP and DHCP output
A repeatable workflow for extracting addresses from network tools, correlating evidence and exporting bulk results.
Lookup tools and reference data
Use the single lookup for one address, the bulk lookup for pasted logs, or browse the vendor directory. The data sources and methodology pages explain how the database is built.