Look up vendor information from MAC addresses using OUI database
A MAC (Media Access Control) address is a unique identifier assigned to network interfaces. The first 3 bytes (OUI) identify the manufacturer.
Bit 0: 0=Unicast, 1=Multicast
Bit 1: 0=Universally Administered (real), 1=Locally Administered (virtual/custom)
Note: This tool uses a subset of the IEEE OUI database. Some vendors may not be recognized.