D4:7C:44:B OPTiM Corporation
Every MAC address from D4:7C:44:B0:00:00 to D4:7C:44:BF:FF:FF belongs to a block the IEEE assigned to OPTiM Corporation. Network cards, phones and other devices it makes carry addresses from here.
Assignment
Who D4:7C:44:B belongs to
Written D4:7C:44:B, D4-7C-44-B or D47C44B, depending on the system. Look up a full address.
Prefix
D4:7C:44:B/28
Organization
OPTiM Corporation
Registry
MA-M (28 bits)
Addresses
1,048,576
First address
D4:7C:44:B0:00:00
Last address
D4:7C:44:BF:FF:FF
Address type
Globally unique, unicast
Registered address
1 Honjo-machi Saga JP 840-8502
Parent block
Inside D4:7C:44
This MA-M block is carved from the 24-bit block D4:7C:44, which the IEEE holds as IEEE Registration Authority and divides among smaller assignees.