This is a universally administered unicast address with a registered vendor prefix.
MAC address78:C2:C0:27:FF:FF
OUI78:C2:C0
Vendor address904, 648, Seobusaet-gil, SEOUL GEUMCHEON-GU KR 153-803
Block range78:C2:C0:20:00:00– 78:C2:C0:2F: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-647A:C2:C0:FF:FE:27:FF:FF
Possible IPv6 link-local derivationfe80::7ac2:c0ff:fe27: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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