64:31:39:4 Active Brains
Every MAC address from 64:31:39:40:00:00 to 64:31:39:4F:FF:FF belongs to a block the IEEE assigned to Active Brains. Network cards, phones and other devices it makes carry addresses from here.
Assignment
Who 64:31:39:4 belongs to
Written 64:31:39:4, 64-31-39-4 or 6431394, depending on the system. Look up a full address.
Prefix
64:31:39:4/28
Organization
Active Brains
Registry
MA-M (28 bits)
Addresses
1,048,576
First address
64:31:39:40:00:00
Last address
64:31:39:4F:FF:FF
Address type
Globally unique, unicast
Registered address
Yokohama Mitsui Bldg.12F, 1-1-2 Takashima, Nishi-ku Yokohama Kanagawa JP 220-0011
Parent block
Inside 64:31:39
This MA-M block is carved from the 24-bit block 64:31:39, which the IEEE holds as IEEE Registration Authority and divides among smaller assignees.
Same organization
Other blocks assigned to Active Brains
2 more blocks registered under the same name.