Who owns MAC prefix 0021DD?

0021DD is registered to Northstar Systems Corp in the IEEE MA-L registry.

What devices use 0021DD?

Any network device with a MAC address starting 00:21:DD was manufactured by or for Northstar Systems Corp.

MA-L · OUI prefix

Northstar Systems Corp

Any MAC address starting 00:21:DD is registered to Northstar Systems Corp in TW.

OUI prefix	0021DD
Vendor	Northstar Systems Corp
Registry	MA-L (24-bit, large block)
Country	TW
Example MAC	00:21:DD:00:00:00

What this means

The IEEE assigned the MA-L block 0021DD to Northstar Systems Corp. 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 00:21:DD, it is Northstar Systems Corp hardware.

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