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On June 8, major enterprises with a presence on the Internet such as Google, Yahoo, Microsoft, Akamai and several United States government agencies will be among the organizations providing their content over both IPv4 and IPv6. The occasion: June 8 is World IPv6 Day. IPv4 is the existing Internet protocol; IPv6 is its successor. As the number of Internet users and devices has grown, the world has grown short on IPv4 addresses and is moving to IPv6, a process that's expected to take 10 to 15 years at least.
Checkout the new free Android app https://market.android.com/details?id=com.tsts.ipv6 (IPv6 and More) which helps network and system administrators with IPv6 testing and transition mechanisms. Also available via the Amazon app store.