Who owns MAC prefix 0021CB?

0021CB is registered to SMS TECNOLOGIA ELETRONICA LTDA in the IEEE MA-L registry.

What devices use 0021CB?

Any network device with a MAC address starting 00:21:CB was manufactured by or for SMS TECNOLOGIA ELETRONICA LTDA.

MA-L · OUI prefix

SMS TECNOLOGIA ELETRONICA LTDA

Any MAC address starting 00:21:CB is registered to SMS TECNOLOGIA ELETRONICA LTDA in BR.

OUI prefix	0021CB
Vendor	SMS TECNOLOGIA ELETRONICA LTDA
Registry	MA-L (24-bit, large block)
Country	BR
Example MAC	00:21:CB:00:00:00

What this means

The IEEE assigned the MA-L block 0021CB to SMS TECNOLOGIA ELETRONICA LTDA. 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:CB, it is SMS TECNOLOGIA ELETRONICA LTDA hardware.

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