These are usually represented as 12 hexadecimal digits in six pairs, separated by colons or hyphens, for example: Most modern NICs are identified by MAC addresses made up of six octets (48 bits). What is an organizationally unique identifier? The Wireshark OUI lookup tool provides an important service for protocol analysis of local network interfaces, but to understand what it is and how it works, it's important to understand how MAC addresses are created and assigned. This means Wireshark analysis reveals the ports network traffic is being sent to, the IP addresses the traffic is traversing and the identity of the NIC through which data is being physically transmitted. Wireshark, the leading open source network protocol analyzer, captures network traffic and enables network engineers to match network protocol data units - packets, segments, datagrams, etc. The first half of the MAC address is the organizationally unique identifier (OUI) that is registered to the NIC vendor. Every NIC can be uniquely identified by its MAC address, with the first half of the physical address identifying the device vendor and the second half of the MAC address uniquely identifying the device itself. When sniffing physical networks, one of the key pieces of information that can be accessed is the MAC address of the connected devices.
This gives network defenders a tool for keeping track of potentially harmful network activity between endpoints. The key to network protocol analysis is to identify network endpoint devices and match them up with other network endpoints.
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