What this means
The IEEE assigned the MA-L block E4F1D4 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 E4:F1:D4, it is vivo Mobile Communication Co., Ltd. hardware.
Frequently Asked Questions
Who owns MAC prefix E4F1D4?
E4F1D4 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 E4F1D4?
Any network device with a MAC address starting E4:F1:D4 was manufactured by or for vivo Mobile Communication Co., Ltd..