OUI Lookup
00123c
Second Rule LLC
Manufacturer Information
- OUI Prefix
- 00123c
- Manufacturer
- Second Rule LLC
- Address
- 4119 Walnut Street Philadelphia PA US 19104
- Last updated
- 6/10/2026
Vendor Statistics
- Total prefixes
- 1
- Block type
- MA-L
- Available addresses
- ~16 millones
About prefix 00123C
The OUI prefix 00123C is assigned to Second Rule LLC, based in 4119 Walnut Street Philadelphia PA US 19104 . 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 Second Rule LLC.