EDIT Here’s how to disable it. If you can’t on your modem/router. Open the network menu from the icon in bottom right of screen > right click on the network you are connected to and click “status” > In the popup click on the “Properties” button > You’ll get another popup with the name of your network adapter in a top line/box and a secondary box with a list of things in it > Look for the entry “Internet Protocol Version 6 (TCP/IPv6)” and uncheck the box in front of it > click OK.
IPv6 is enabled by default on windows.
EDIT Here’s how to disable it. If you can’t on your modem/router. Open the network menu from the icon in bottom right of screen > right click on the network you are connected to and click “status” > In the popup click on the “Properties” button > You’ll get another popup with the name of your network adapter in a top line/box and a secondary box with a list of things in it > Look for the entry “Internet Protocol Version 6 (TCP/IPv6)” and uncheck the box in front of it > click OK.
I’ve just queried it my IP is V4 so presumably I’m fine.
you can have both addresses at the same time - this site shows both if you have them: https://whatismyipaddress.com/
Or, just type
ping -6 google.comfrom a command prompt. It won’t work if you don’t have ipv6.