MIB: SNMPv2-MIB.
The vendor's authoritative identification of the network management subsystem contained in the entity. This value is allocated within the SMI enterprise's subtree (1.3.6.1.4.1) and provides an easy and unambiguous means for determining "what kind of box" is being managed.
For example, if the vendor "Flintstones, Inc." was assigned the subtree 1.3.6.1.4.1.4242, it could assign the identifier 1.3.6.1.4.1.4242.1.1 to its "Fred Router".