MAC prefix 90:F4:21:0
Gemstone Lights
| Vendor | Gemstone Lights |
|---|---|
| Short name | GemstoneLigh |
| Prefix | 90:F4:21:0/28 |
| Block type | MA-M (/28, 1,048,576 addresses) |
| Address range | 90:F4:21:00:00:00 – 90:F4:21:0F:FF:FF |
| Notations | 90:F4:21:00:00:0090-F4-21-00-00-0090f4.2100.000090F421000000 |
Frequently asked questions
Which vendor does MAC address 90:F4:21:0 belong to?
MAC addresses starting with 90:F4:21:0 are assigned to Gemstone Lights according to the IEEE registry (prefix length 28 bits).
How many addresses does block 90:F4:21:0 contain?
The block contains 1,048,576 addresses from 90:F4:21:00:00:00 to 90:F4:21:0F:FF:FF.
Is 90:F4:21:0 a unicast or multicast address?
The least significant bit of the first byte is 0 – it is a unicast address. The U/L bit is 0, so the address is globally unique (universally administered).
How do I find the MAC address of my device?
On Linux use ip link, on Windows getmac /v or ipconfig /all, on macOS ifconfig. Note: phones and recent operating systems often use random, locally administered addresses on Wi-Fi.