MAC prefix A4:B1:21
Arantia 2010 S.L.
| Vendor | Arantia 2010 S.L. |
|---|---|
| Short name | Arantia2010S |
| Prefix | A4:B1:21/24 |
| Block type | MA-L (/24, 16,777,216 addresses) |
| Address range | A4:B1:21:00:00:00 – A4:B1:21:FF:FF:FF |
| Notations | A4:B1:21:00:00:00A4-B1-21-00-00-00a4b1.2100.0000A4B121000000 |
Frequently asked questions
Which vendor does MAC address A4:B1:21 belong to?
MAC addresses starting with A4:B1:21 are assigned to Arantia 2010 S.L. according to the IEEE registry (prefix length 24 bits).
How many addresses does block A4:B1:21 contain?
The block contains 16,777,216 addresses from A4:B1:21:00:00:00 to A4:B1:21:FF:FF:FF.
Is A4:B1:21 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.