MAC prefix 00:21:B3
Ross Controls
| Vendor | Ross Controls |
|---|---|
| Short name | RossControls |
| Prefix | 00:21:B3/24 |
| Block type | MA-L (/24, 16,777,216 addresses) |
| Address range | 00:21:B3:00:00:00 – 00:21:B3:FF:FF:FF |
| Notations | 00:21:B3:00:00:0000-21-B3-00-00-000021.b300.00000021B3000000 |
Frequently asked questions
Which vendor does MAC address 00:21:B3 belong to?
MAC addresses starting with 00:21:B3 are assigned to Ross Controls according to the IEEE registry (prefix length 24 bits).
How many addresses does block 00:21:B3 contain?
The block contains 16,777,216 addresses from 00:21:B3:00:00:00 to 00:21:B3:FF:FF:FF.
Is 00:21:B3 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.