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 address1A:90:21:7F:FF:FF
OUI1A:90:21
Vendor address65 Washington St. Suite 170 Santa Clara CA US 95050
Country🇺🇸 United States
Block range1A:90:21:00:00:00– 1A:90:21: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-6418:90:21:FF:FE:7F:FF:FF
Possible IPv6 link-local derivationfe80::1890:21ff: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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