20:B3:7F:4 OTP CO.,LTD.
Every MAC address from 20:B3:7F:40:00:00 to 20:B3:7F:4F:FF:FF belongs to a block the IEEE assigned to OTP CO.,LTD.. Network cards, phones and other devices it makes carry addresses from here.
Assignment
Who 20:B3:7F:4 belongs to
Written 20:B3:7F:4, 20-B3-7F-4 or 20B37F4, depending on the system. Look up a full address.
Prefix
20:B3:7F:4/28
Organization
OTP CO.,LTD.
Registry
MA-M (28 bits)
Addresses
1,048,576
First address
20:B3:7F:40:00:00
Last address
20:B3:7F:4F:FF:FF
Address type
Globally unique, unicast
Registered address
817 the SOHO, 2-7-4, AOMI, KOTO-KU,TOKYO JAPAN TOKYO TOKYO JP 135-0064
Parent block
Inside 20:B3:7F
This MA-M block is carved from the 24-bit block 20:B3:7F, which the IEEE holds as IEEE Registration Authority and divides among smaller assignees.