Who owns MAC prefix 0021E3?

0021E3 is registered to SerialTek LLC in the IEEE MA-L registry.

What devices use 0021E3?

Any network device with a MAC address starting 00:21:E3 was manufactured by or for SerialTek LLC.

MA-L · OUI prefix

SerialTek LLC

Any MAC address starting 00:21:E3 is registered to SerialTek LLC in US.

OUI prefix	0021E3
Vendor	SerialTek LLC
Registry	MA-L (24-bit, large block)
Country	US
Example MAC	00:21:E3:00:00:00

What this means

The IEEE assigned the MA-L block 0021E3 to SerialTek LLC. 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:E3, it is SerialTek LLC hardware.

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