This memo defines a portion of the Management Information Base (MIB) for devices implementing the Network Address Translator (NAT) function. The new MIB module defined in this document@ NATV2-MIB@ is intended to replace module NAT-MIB (RFC 4008). NATV2-MIB is not backwards compatible with NAT-MIB@ for reasons given in the text of this document. A companion document deprecates all objects in NATMIB. NATV2-MIB can be used for the monitoring of NAT instances on a device capable of NAT function. Compliance levels are defined for three application scenarios: basic NAT@ pooled NAT@ and carrier-grade NAT (CGN).