MAC prefix 90:F4:21:1
BeEnergy SG GmbH
| Vendor | BeEnergy SG GmbH |
|---|---|
| Short name | BeEnergySG |
| Prefix | 90:F4:21:1/28 |
| Block type | MA-M (/28, 1,048,576 addresses) |
| Address range | 90:F4:21:10:00:00 – 90:F4:21:1F:FF:FF |
| Notations | 90:F4:21:10:00:0090-F4-21-10-00-0090f4.2110.000090F421100000 |
Frequently asked questions
Which vendor does MAC address 90:F4:21:1 belong to?
MAC addresses starting with 90:F4:21:1 are assigned to BeEnergy SG GmbH according to the IEEE registry (prefix length 28 bits).
How many addresses does block 90:F4:21:1 contain?
The block contains 1,048,576 addresses from 90:F4:21:10:00:00 to 90:F4:21:1F:FF:FF.
Is 90:F4:21:1 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.