OUI Lookup
0021c3
CORNELL Communications, Inc.
Manufacturer Information
- OUI Prefix
- 0021c3
- Manufacturer
- CORNELL Communications, Inc.
- Address
- 7915 N. 81st Street Milwaukee Wisconsin US 53223
- Last updated
- 6/11/2026
Vendor Statistics
- Total prefixes
- 1
- Block type
- MA-L
- Available addresses
- ~16 millones
About prefix 0021C3
The OUI prefix 0021C3 is assigned to CORNELL Communications, Inc., based in 7915 N. 81st Street Milwaukee Wisconsin US 53223 . 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 CORNELL Communications, Inc..