MAC prefix 40:D8:55:1D:5

FST21 Ltd.

VendorFST21 Ltd.
Short nameFST21
Prefix40:D8:55:1D:5/36
Block typeMA-S (/36, 4,096 addresses)
Address range40:D8:55:1D:50:00 – 40:D8:55:1D:5F:FF
Notations40:D8:55:1D:50:00
40-D8-55-1D-50-00
40d8.551d.5000
40D8551D5000

Frequently asked questions

Which vendor does MAC address 40:D8:55:1D:5 belong to?

MAC addresses starting with 40:D8:55:1D:5 are assigned to FST21 Ltd. according to the IEEE registry (prefix length 36 bits).

How many addresses does block 40:D8:55:1D:5 contain?

The block contains 4,096 addresses from 40:D8:55:1D:50:00 to 40:D8:55:1D:5F:FF.

Is 40:D8:55:1D:5 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.

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