MAC Address Lookup
Look up MAC address vendor information and identify device manufacturers using the OUI database.
MAC Address Lookup
Supports formats: XX:XX:XX:XX:XX:XX, XX-XX-XX-XX-XX-XX, XXXXXXXXXXXX
Sample MAC Addresses
No MAC lookup results yet
Enter a MAC address and click "Lookup MAC"
About MAC Addresses
MAC Address Structure
48-bit identifier: 24-bit OUI + 24-bit device identifier
OUI (Organizationally Unique Identifier)
First 3 bytes assigned by IEEE to manufacturers
Device Identifier
Last 3 bytes assigned by manufacturer to each device
Unicast vs Multicast
LSB of first byte: 0=unicast, 1=multicast
Global vs Local
2nd LSB of first byte: 0=global, 1=locally administered
Common Uses
Network switching, Wake-on-LAN, device identification
Privacy Concerns
Modern devices use MAC randomization for privacy
Virtual Machines
VMs often use specific OUI ranges (VMware, VirtualBox)