This is a universally administered unicast address with a registered vendor prefix.
MAC address84:3C:99:7F:FF:FF
OUI84:3C:99
Vendor address12/F.,zte R&D building ,kejinan Road,Shenzhen,P.R.China shenzhen guangdong CN 518057
Block range84:3C:99:00:00:00– 84:3C:99: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-6486:3C:99:FF:FE:7F:FF:FF
Possible IPv6 link-local derivationfe80::863c:99ff: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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