MAC prefix 64:31:39:4
| Vendor | Active Brains |
|---|---|
| Short name | ActiveBrains |
| Prefix | 64:31:39:4/28 |
| Block type | MA-M (/28, 1,048,576 addresses) |
| Address range | 64:31:39:40:00:00 – 64:31:39:4F:FF:FF |
| Notations | 64:31:39:40:00:0064-31-39-40-00-006431.3940.0000643139400000 |
Frequently asked questions
Which vendor does MAC address 64:31:39:4 belong to?
MAC addresses starting with 64:31:39:4 are assigned to Active Brains according to the IEEE registry (prefix length 28 bits).
How many addresses does block 64:31:39:4 contain?
The block contains 1,048,576 addresses from 64:31:39:40:00:00 to 64:31:39:4F:FF:FF.
Is 64:31:39:4 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 Active Brains have?
Active Brains holds 3 registered prefixes in total – the full list is on the vendor page.