Who owns MAC prefix 909F33?

909F33 is registered to EFM Networks in the IEEE MA-L registry.

What devices use 909F33?

Any network device with a MAC address starting 90:9F:33 was manufactured by or for EFM Networks.

MA-L · OUI prefix

EFM Networks

Any MAC address starting 90:9F:33 is registered to EFM Networks in KR.

OUI prefix	909F33
Vendor	EFM Networks
Registry	MA-L (24-bit, large block)
Country	KR
Example MAC	90:9F:33:00:00:00

What this means

The IEEE assigned the MA-L block 909F33 to EFM Networks. 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 90:9F:33, it is EFM Networks hardware.

Other EFM Networks prefixes

EFM Networks holds 8 registered blocks in total.

00089F 002666 588694 64E599 705DCC 88366C B0386C

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