Who owns MAC prefix F81D781?

F81D781 is registered to ADTECHNO Inc. in the IEEE MA-M registry.

What devices use F81D781?

Any network device with a MAC address starting F8:1D:78:1 was manufactured by or for ADTECHNO Inc..

MA-M · OUI prefix

ADTECHNO Inc.

Any MAC address starting F8:1D:78:1 is registered to ADTECHNO Inc. in JP.

OUI prefix	F81D781
Vendor	ADTECHNO Inc.
Registry	MA-M (28-bit, medium block)
Country	JP
Example MAC	F8:1D:78:1:00:00:00

What this means

The IEEE assigned the MA-M block F81D781 to ADTECHNO Inc.. 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 F8:1D:78:1, it is ADTECHNO Inc. hardware.

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