OUI Lookup
0021bb
Riken Keiki Co., Ltd.
Manufacturer Information
- OUI Prefix
- 0021bb
- Manufacturer
- Riken Keiki Co., Ltd.
- Address
- 2-7-6 Azusawa Itabashi-Ku Tokyo JP 174-8744
- Last updated
- 6/9/2026
Vendor Statistics
- Total prefixes
- 1
- Block type
- MA-L
- Available addresses
- ~16 millones
About prefix 0021BB
The OUI prefix 0021BB is assigned to Riken Keiki Co., Ltd., based in 2-7-6 Azusawa Itabashi-Ku Tokyo JP 174-8744 . It is a MA-L type block of 24 bits (first three octets). Allows up to 16 million unique MAC addresses. If you find this prefix on your network, the devices belong to Riken Keiki Co., Ltd..