This is a universally administered unicast address with a registered vendor prefix.
MAC addressC4:FF:84:DF:FF:FF
OUIC4:FF:84
Vendor addressUnit 1002, 10/F, Perfect Commercial Buliding, 20 Austin Avenue Tsim Sha Tsui Kowloon CN 999077
Block rangeC4:FF:84:D0:00:00– C4:FF:84:DF:FF:FF
Address capacity1,048,576
TransmissionUnicast: addressed to a single device
AdministrationUniversally administered: its prefix comes from a block registered through the IEEE Registration Authority
RandomizationNot randomized
Derived modified EUI-64C6:FF:84:FF:FE:DF:FF:FF
Possible IPv6 link-local derivationfe80::c6ff:84ff:fedf:ffff

The EUI-64 and IPv6 link-local fields are a mathematical derivation from this MAC address. They don't confirm the device currently uses that IPv6 address.

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