This is a universally administered unicast address with a registered vendor prefix.
MAC addressE4:38:19:FF:FF:FF
OUIE4:38:19
Vendor addressRoom 1705, 1706, 1709A, 17th Floor, Building E, Xinghe WORLD, Minle Community, Minzhi Street, Longhua District Shenzhen Guangdong CN 518000
Block rangeE4:38:19:00:00:00– E4:38:19: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-64E6:38:19:FF:FE:FF:FF:FF
Possible IPv6 link-local derivationfe80::e638:19ff: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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