Who owns MAC prefix 000021?

000021 is registered to SUREMAN COMP. & COMMUN. CORP. in the IEEE MA-L registry.

What devices use 000021?

Any network device with a MAC address starting 00:00:21 was manufactured by or for SUREMAN COMP. & COMMUN. CORP..

MA-L · OUI prefix

SUREMAN COMP. & COMMUN. CORP.

Any MAC address starting 00:00:21 is registered to SUREMAN COMP. & COMMUN. CORP..

OUI prefix	000021
Vendor	SUREMAN COMP. & COMMUN. CORP.
Registry	MA-L (24-bit, large block)
Example MAC	00:00:21:00:00:00

What this means

The IEEE assigned the MA-L block 000021 to SUREMAN COMP. & COMMUN. 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 00:00:21, it is SUREMAN COMP. & COMMUN. CORP. hardware.

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