The world is running out of IPv4 addresses. Those are the IP addresses most people would recognize. xxx.xxx.xxx.xxx There are a total of 4.3 billion IP addresses available. Each device on the internet needs it's own address, so you can imagine how we can be running low on IPv4 addresses.
The addition of IPv6 has increased the number of available IP addresses to 340 trillion, trillion, trillion. That should be enough for a while.
An IPv6 address is much longer than an IPv4 address. Most people would never need to know their IP address, and would not even know if they are using IPv6 or not. Most new technology purchased today has IPv6 capability built in. Most internet companies are running both IPv4 and IPv6. Google, Yahoo, ACT USA, Facebook, Netflix, etc. so even those with older devices can still use their websites.
Most operating systems have the capability already (Windows Vista and newer, Mac OS X and newer, and most Linux distributions)
There may be a day, however, when an IPv4-only device would not be able to access a website/service if its only broadcasting in IPv6.
You may already have the capability to run IPv6 and might not even know it. Click the link below to check.