Any NIC with a MAC address that begins with 00:05:85 is a Juniper NIC. A List of registered OUIs is available at Organizations that manufacture NICs, such as Cisco, Juniper, HP, IBM, and many others, purchase 24-bit OUIs from the Institute of Electrical and Electronics Engineers (IEEE), Incorporated Registration Authority. They have two halves: the first 24 bits form the Organizationally Unique Identifier (OUI) and the last 24 bits form a serial number (formally called an extension identifier). Historically, MAC addresses were 48 bits long. There are real-world exceptions to this, often due to mistakes by NIC manufacturers, but hardware MAC addresses are considered unique on the exam. ![]() Burned-in MAC addresses should be unique.
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