IPv4 is composed of 32-bit address length and is the fourth version of the Internet Protocol (IP). IPv6 is composed of 128-bit address length and is the latest updated version of the Internet Protocol (IP).  IPv4 addresses look this: 192.168.1.1 and IPv6 addresses look like this: fe80::d4a8:6435:d2d8:d9f3b11

If on windows, open up a command prompt, type 'ipconfig', then hit enter. If you see an IPv6 address, then you are using IPv6. If not, then contact your ISP and ask that they give you IPv6 support.
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