MAC prefix 40:91:51
| Vendor | Espressif Inc. |
|---|---|
| Short name | Espressif |
| Prefix | 40:91:51/24 |
| Block type | MA-L (/24, 16,777,216 addresses) |
| Address range | 40:91:51:00:00:00 – 40:91:51:FF:FF:FF |
| Notations | 40:91:51:00:00:0040-91-51-00-00-004091.5100.0000409151000000 |
Frequently asked questions
Which vendor does MAC address 40:91:51 belong to?
MAC addresses starting with 40:91:51 are assigned to Espressif Inc. according to the IEEE registry (prefix length 24 bits).
How many addresses does block 40:91:51 contain?
The block contains 16,777,216 addresses from 40:91:51:00:00:00 to 40:91:51:FF:FF:FF.
Is 40:91:51 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.
Which other MAC prefixes does Espressif Inc. have?
Espressif Inc. holds 355 registered prefixes in total – the full list is on the vendor page.