This is a universally administered unicast address with a registered vendor prefix.
MAC address78:98:E8:7F:FF:FF
OUI78:98:E8
Vendor address1 Internal Business Park, #03-12,The Synergy Singapore Singapore SG 609917
Block range78:98:E8:00:00:00– 78:98:E8: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:98:E8:FF:FE:7F:FF:FF
Possible IPv6 link-local derivationfe80::7a98:e8ff: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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