This is a universally administered unicast address with a registered vendor prefix.
MAC addressD4:DA:21:00:00:00
OUID4:DA:21
Vendor addressThe Rainbow City Office Building, 68 Qinghe Middle Street Haidian District Beijing Beijing CN 100085
Block rangeD4:DA:21:00:00:00– D4:DA:21: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-64D6:DA:21:FF:FE:00:00:00
Possible IPv6 link-local derivationfe80::d6da:21ff:fe00:0

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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