IPv6 launch day

Internet launched operationally in 1983,with billions of devices and users trying to get online today and serving nearly 2.5 billion people and 11 billion devices across the globe.
The need for IPv6 :


In order to connect to the Internet, each device has to have an IP address—a numerical label which identifies every computer, phone, tablet, ebook reader, etc. IP addresses allow machines to find and communicate with each other online–without them you couldn't check your email, visit websites or watch videos. But like a telephone network that is running out of phone numbers, the current Internet is running out of IP addresses.IPv4 address has 32-bit address and IPv6 has 128-bit.


The Internet we've relied on so far has space for 2^32 addresses—about 4.3 billion. The new, larger IPv6 expands the limit to 2^128 addresses—more than 340 trillion, trillion, trillion! Enough for essentially unlimited growth for the foreseeable future.


In February 2011, the Internet Assigned Numbers Authority (IANA) ran out of addresses to allocate to the Regional Internet Registries. While some of your devices may already share a single address (your home router acts like a switchboard for your home's devices), if IPv6 isn't implemented you'd soon have to share a single address with multiple people or even a whole neighborhood. This tangled, constrained Internet would be unsafe and unsustainable.


World IPv6 Launch, coordinated by the Internet Society, marks the day(6th june) that participating websites, Internet Service Providers (ISP), and network hardware manufacturers switch on IPv6 permanently in parallel with IPv4.

IPv6 is not present in Windows XP but is available from Windows Vista onwards so for an IPv6 address you might need proper upgradation. Same is with the other OS,the older version not supporting it but now almost all OS has it.