This is a locally administered address in the IEEE 802c ELI (Extended Local Identifier) quadrant, whose company ID is registered to a real organization. The vendor identity can be trusted even though the address itself is not universally administered.
MAC addressDA:28:EC:7F:FF:FF
OUIDA:28:EC
Vendor addressHUST Science & Technology Park, East Lake High-Tech Development Zone Wuhan Hubei CN 430223
Block rangeDA:28:EC:00:00:00– DA:28:EC:FF:FF:FF
Address capacity16,777,216
TransmissionUnicast: addressed to a single device
AdministrationLocally administered: set by software, not burned into hardware
IEEE 802c quadrantELI: Extended Local Identifier
RandomizationLikely randomized
Derived modified EUI-64D8:28:EC:FF:FE:7F:FF:FF
Possible IPv6 link-local derivationfe80::d828:ecff: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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