38:3A:21:3 Shanghai Greatwall Safety System Co.,Ltd
Every MAC address from 38:3A:21:30:00:00 to 38:3A:21:3F:FF:FF belongs to a block the IEEE assigned to Shanghai Greatwall Safety System Co.,Ltd. Network cards, phones and other devices it makes carry addresses from here.
Assignment
Who 38:3A:21:3 belongs to
Written 38:3A:21:3, 38-3A-21-3 or 383A213, depending on the system. Look up a full address.
Prefix
38:3A:21:3/28
Organization
Shanghai Greatwall Safety System Co.,Ltd
Registry
MA-M (28 bits)
Addresses
1,048,576
First address
38:3A:21:30:00:00
Last address
38:3A:21:3F:FF:FF
Address type
Globally unique, unicast
Registered address
502B - Bloc ,No.168 Luoyang Str ShangHai CN 201100
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.