This is a universally administered unicast address with a registered vendor prefix.
MAC addressEC:42:B4:7F:FF:FF
OUIEC:42:B4
Vendor address77-1, Miyako Namegawa-machi, Hiki-gun Saitama Pref. JP 355-0812
Block rangeEC:42:B4:00:00:00– EC:42:B4: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-64EE:42:B4:FF:FE:7F:FF:FF
Possible IPv6 link-local derivationfe80::ee42:b4ff:fe7f: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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