Who owns MAC prefix 383A21D?

383A21D is registered to Colooc AB in the IEEE MA-M registry.

What devices use 383A21D?

Any network device with a MAC address starting 38:3A:21:D was manufactured by or for Colooc AB.

MA-M · OUI prefix

Colooc AB

Any MAC address starting 38:3A:21:D is registered to Colooc AB in SE.

OUI prefix	383A21D
Vendor	Colooc AB
Registry	MA-M (28-bit, medium block)
Country	SE
Example MAC	38:3A:21:D:00:00:00

What this means

The IEEE assigned the MA-M block 383A21D to Colooc AB. Every network interface they manufacture under this block has a MAC address beginning with these digits, followed by a unique per-device identifier. If a device on your network shows a MAC starting 38:3A:21:D, it is Colooc AB hardware.

Look up another MAC