What this means
The IEEE assigned the MA-L block A4A528 to Sichuan Tianyi Comheart Telecom Co.,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 A4:A5:28, it is Sichuan Tianyi Comheart Telecom Co.,LTD hardware.
Frequently Asked Questions
Who owns MAC prefix A4A528?
A4A528 is registered to Sichuan Tianyi Comheart Telecom Co.,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. Sichuan Tianyi Comheart Telecom Co.,LTD's block covers 16,777,216 addresses.
What devices use A4A528?
Any network device with a MAC address starting A4:A5:28 was manufactured by or for Sichuan Tianyi Comheart Telecom Co.,LTD.