What this means
The IEEE assigned the MA-L block A40B78 to FAST PHOTONICS HK CO., LIMITED. 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 A4:0B:78, it is FAST PHOTONICS HK CO., LIMITED hardware.
Frequently Asked Questions
Who owns MAC prefix A40B78?
A40B78 is registered to FAST PHOTONICS HK CO., LIMITED in the IEEE MA-L registry.
What does the MA-L registry type mean?
An MA-L assignment, the IEEE's original OUI format, gives the vendor the first three octets and 16,777,216 device addresses under them. FAST PHOTONICS HK CO., LIMITED's block covers 16,777,216 addresses.
What devices use A40B78?
Any network device with a MAC address starting A4:0B:78 was manufactured by or for FAST PHOTONICS HK CO., LIMITED.