38:3A:21:0 R3C Information(Shenzhen) Co.，Ltd.
Every MAC address from 38:3A:21:00:00:00 to 38:3A:21:0F:FF:FF belongs to a block the IEEE assigned to R3C Information(Shenzhen) Co.，Ltd.. Network cards, phones and other devices it makes carry addresses from here.
Assignment
Who 38:3A:21:0 belongs to
Written 38:3A:21:0, 38-3A-21-0 or 383A210, depending on the system. Look up a full address.
Prefix
38:3A:21:0/28
Organization
R3C Information(Shenzhen) Co.，Ltd.
Registry
MA-M (28 bits)
Addresses
1,048,576
First address
38:3A:21:00:00:00
Last address
38:3A:21:0F:FF:FF
Address type
Globally unique, unicast
Registered address
2F,JinHuiQiou Building,Langshan2 Road,Hi-Tech Ind.Park, Nanshan District Shenzhen GuangDong CN 86
Parent block
Inside 38:3A:21
This MA-M block is carved from the 24-bit block 38:3A:21, which the IEEE holds as IEEE Registration Authority and divides among smaller assignees.