MAC prefix F4:B3:81
WindowMaster A/S
| Vendor | WindowMaster A/S |
|---|---|
| Short name | WindowMaster |
| Prefix | F4:B3:81/24 |
| Block type | MA-L (/24, 16,777,216 addresses) |
| Address range | F4:B3:81:00:00:00 – F4:B3:81:FF:FF:FF |
| Notations | F4:B3:81:00:00:00F4-B3-81-00-00-00f4b3.8100.0000F4B381000000 |
Frequently asked questions
Which vendor does MAC address F4:B3:81 belong to?
MAC addresses starting with F4:B3:81 are assigned to WindowMaster A/S according to the IEEE registry (prefix length 24 bits).
How many addresses does block F4:B3:81 contain?
The block contains 16,777,216 addresses from F4:B3:81:00:00:00 to F4:B3:81:FF:FF:FF.
Is F4:B3:81 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.