I doubt that consumer-class networks will use the D and E classes-
[IP Address Class E and Limited Broadcast
The IPv4 networking standard defines Class E addresses as reserved, meaning that they should not be used on IP networks. Some research organizations use Class E addresses for experimental purposes. However, nodes that try to use these addresses on the Internet will be unable to communicate properly.]
[IP Address Class D and Multicast
The IPv4 networking standard defines Class D addresses as reserved for multicast. Multicast is a mechanism for defining groups of nodes and sending IP messages to that group rather than to every node on the LAN (broadcast) or just one other node (unicast).
Multicast is mainly used on research networks. As with Class E, Class D addresses should not be used by ordinary nodes on the Internet.]
http://compnetworking.about.com/od/workingwithipaddresses/l/aa042400b.htmThese classes are only used for research.