What this means
The IEEE assigned the MA-L block F81B04 to Zhong Shan City Richsound Electronic Industrial Ltd. 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 F8:1B:04, it is Zhong Shan City Richsound Electronic Industrial Ltd hardware.
Frequently Asked Questions
Who owns MAC prefix F81B04?
F81B04 is registered to Zhong Shan City Richsound Electronic Industrial Ltd 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. Zhong Shan City Richsound Electronic Industrial Ltd's block covers 16,777,216 addresses.
What devices use F81B04?
Any network device with a MAC address starting F8:1B:04 was manufactured by or for Zhong Shan City Richsound Electronic Industrial Ltd.