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.
Frequently Asked Questions
Who owns MAC prefix F81D781?
F81D781 is registered to ADTECHNO Inc. in the IEEE MA-M registry.
What does the MA-M registry type mean?
An MA-M assignment covers 28 bits of the address, giving the vendor 1,048,576 device addresses, a quarter of a full MA-L block. ADTECHNO Inc.'s block covers 1,048,576 addresses.
What devices use F81D781?
Any network device with a MAC address starting F8:1D:78:1 was manufactured by or for ADTECHNO Inc..