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What part of a MAC address is the OUI?

The OUI is commonly the first six hexadecimal characters of a 48-bit MAC address.

Why can an OUI lookup be unknown?

The address may be locally administered, randomized, missing from the local vendor data, or assigned through a newer registry block.

OUI Lookup Explained | Reload in 5

Learn how OUI lookup works, why the first six hex characters of a MAC address identify a vendor, and how to troubleshoot unknown devices.

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