Меня самого долго интересовал этот вопрос . Вот интересный подоход к ответу: клик.

This visualization represents a macroscopic snapshot of the IPv6 Internet topology collected around March 4th, 2005. Topology data gathered from 17 monitors probing approximately 860 globally routable IPv6 network prefixes include 2,913 IPv6 addresses and 7,905 IPv6 links (immediately adjacent addresses in a traceroute-like path).