This is a universally administered unicast address with a registered vendor prefix.
MAC address58:C4:1E:9F:FF:FF
OUI58:C4:1E
Vendor address206A,Building 30,Nan Tou Gate 2nd Road, Wisdomland Business Park,NanShan District,ShenZhen P.R.C ShenZhen GuangDong CN 518000
Block range58:C4:1E:90:00:00– 58:C4:1E:9F: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-645A:C4:1E:FF:FE:9F:FF:FF
Possible IPv6 link-local derivationfe80::5ac4:1eff:fe9f: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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