IPMB, V1.0, Address Allocation: Document
The document presents the allocation and use of inter-integrated circuit slave addresses for devices on the Intelligent Platform Management Bus (IPMB). Address 20h is used as a well-known fixed address. Address 20h is reserved for the system’s primary management controller, which is also referred to as the baseboard management controller.
Read the full IPMB, V1.0, Address Allocation Document.