In 1996, the MIB II was updated in order to manage IPv4 networks. It was defined by the RFC 2011 (IP MIB) [RFC2011], RFC 2012 (TCP MIB) [RFC2012], RFC 2013 (UDP MIB) [RFC2013] and RFC 2096 (IP forwarding MIB) [RFC2096]. Three groups were defined: ip, tcp and udp. Each group contains simple objects and tables (see Figure 7-1).

In 2002, the approach, illustrated in Figure 7-1, unified all the tables: ipAddrTable became ipAddressTable, ipNetToMediaTable became ipNetToMediaTable, and all the simple objects defined in the IPv4 MIB II became the ipIfStatsTable. Similarly, tcpConnTable became tcpConnectionTable, and udpTable became udpListenerTable. It must be noticed that, in addition to this table, issued from the IPv4 management architecture, new tables were defined like the ipv6InterfaceTable. RFC 2851 [RFC2851] (now updated with RFC 3291 [RFC3291] and RFC 4001 [RFC4001]) describes textual conventions to represent both versions of IP in MIBs. The existing MIBs (RFC 2011, 2012, 2013 and 2096) were updated following this new textual convention. Respectively, these are RFC 2011bis [RFC2011bis] (currently in the RFC editors queue), RFC 4022 [RFC4022], RFC 4113 [RFC4113], and RFC 2096bis [RFC2096bis] (also still in the RFC editors queue).