This is a universally administered unicast address with a registered vendor prefix.
MAC address6C:1E:90:00:00:00
OUI6C:1E:90
Vendor address55, Hansam-ro, Deoksan-Myeon Jincheon-Gun Chungbuk KR 27850
Block range6C:1E:90:00:00:00– 6C:1E:90:FF:FF:FF
Address capacity16,777,216
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-646E:1E:90:FF:FE:00:00:00
Possible IPv6 link-local derivationfe80::6e1e:90ff:fe00:0

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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