Clutching at straws here, but... One use case for 128 bit addressing is for a single-address-space OS running on a cluster. http://en.wikipedia.org/wiki/Singl

Clutching at straws here, but... One use case for 128 bit addressing is for a single-address-space OS running on a cluster. http://en.wikipedia.org/wiki/Single_address_space_operating_system http://en.wikipedia.org/wiki/Single_address_space_operating_... Pointers can have 32 bits for the IP address of the hosting node and 64 bits for the address within the node, and 32 bits spare for various flags.