This is a universally administered unicast address with a registered vendor prefix.
MAC address78:7D:48:FF:FF:FF
OUI78:7D:48
Vendor addressRM B3 & B4 BLOCK B, KO FAI INDUSTRIAL BUILDING NO.7 KO FAI ROAD, YAU TONG, KLN, H.K Hong Kong KOWLOON HK 999077
Block range78:7D:48:00:00:00– 78:7D:48: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-647A:7D:48:FF:FE:FF:FF:FF
Possible IPv6 link-local derivationfe80::7a7d:48ff:feff: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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