What this means
The IEEE assigned the MA-L block 28D555 to vivo Mobile Communication 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 28:D5:55, it is vivo Mobile Communication Co., Ltd. hardware.
Frequently Asked Questions
Who owns MAC prefix 28D555?
28D555 is registered to vivo Mobile Communication 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. vivo Mobile Communication Co., Ltd.'s block covers 16,777,216 addresses.
What devices use 28D555?
Any network device with a MAC address starting 28:D5:55 was manufactured by or for vivo Mobile Communication Co., Ltd..