00:21:BB Riken Keiki Co., Ltd.
Every MAC address from 00:21:BB:00:00:00 to 00:21:BB:FF:FF:FF belongs to a block the IEEE assigned to Riken Keiki Co., Ltd.. Network cards, phones and other devices it makes carry addresses from here.
Assignment
Who 00:21:BB belongs to
Written 00:21:BB, 00-21-BB or 0021BB, depending on the system. Look up a full address.
Prefix
00:21:BB
Organization
Riken Keiki Co., Ltd.
Registry
MA-L (a 24-bit OUI)
Addresses
16,777,216
First address
00:21:BB:00:00:00
Last address
00:21:BB:FF:FF:FF
Address type
Globally unique, unicast
Registered address
2-7-6 Azusawa Itabashi-Ku Tokyo JP 174-8744