How MAC Address Lookup Works
A detailed guide on hardware identifiers and the data extracted by this analyzer.
What is an OUI?
The first three bytes (24 bits) of a MAC address are known as the **Organizationally Unique Identifier (OUI)**. These bits are assigned by the IEEE to specific manufacturers like Apple, Samsung, or Intel.
By looking up the OUI, we can determine the vendor of a network interface card (NIC), which helps in identifying devices on a local network for security audits or troubleshooting.
Bitwise Breakdown
- Unicast: The frame is meant for a single receiving NIC.
- Multicast: The frame is meant for multiple receivers (identified if the first byte is odd).
- UAA: Universally Administered Address (Assigned by manufacturer).
- LAA: Locally Administered Address (Overridden by software/admin).