This is a universally administered unicast address with a registered vendor prefix.
MAC address04:C9:8B:57:FF:FF
OUI04:C9:8B
Vendor address530 DIVISADERO ST, PMB 722 San Francisco CA US 94117
Block range04:C9:8B:50:00:00– 04:C9:8B:5F: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-6406:C9:8B:FF:FE:57:FF:FF
Possible IPv6 link-local derivationfe80::6c9:8bff:fe57: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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