How do you test your IPv6 connectivity?

The best way to do this is go to this site which provides many other sites from where you can search. Go here directly:

http://test-ipv6.com/

You get both the IPv4 and IPv6 of your ISP. You also get related information about your ISP.

Intentionally some parts of IPv4 and IPv6 are sliced off.

How do I find my WAN IP Address in IPv6 format?

All traffic coming to your computer is via your router which then routes the traffic to your local IP Address.

One way to find your WAN IP address, the address assigned to you by your Internet Provider is go to the site. It can be in IPv4 or IPv6 format.

In my previous post you saw how to find the IPv4 address.

To find the WAN IP Address in IPv6 format just access the following site from your computer that is in a local network behind your router:

https://whatismyipaddress.com/?u=TRUE

Which immediately responds by showing your WAN IP Address as well as your host server as shown for my ISP Provider:

Does ping use IPv4 or IPv6?

In Windows 10 machine when I ping a web site such as WWW.Microsoft.com, I get the response as shown:

C:\Users\Jayaram>ping www.microsoft.com
Pinging e10088.dspb.akamaiedge.net [2600:1406:1f:386::2768] with 32 bytes of data:
Reply from 2600:1406:1f:386::2768: time=72ms
Reply from 2600:1406:1f:386::2768: time=64ms
Reply from 2600:1406:1f:386::2768: time=64ms
Reply from 2600:1406:1f:386::2768: time=65ms
Ping statistics for 2600:1406:1f:386::2768:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 64ms, Maximum = 72ms, Average = 66ms

The default appears to be IPv6

However, if I need to ping the IPv4 then I can ping as shown.
C:\Users\Jayaram>ping -4 www.microsoft.com
Pinging e10088.dspb.akamaiedge.net [23.15.90.161] with 32 bytes of data:
Reply from 23.15.90.161: bytes=32 time=84ms TTL=55
Reply from 23.15.90.161: bytes=32 time=89ms TTL=55
Reply from 23.15.90.161: bytes=32 time=64ms TTL=55
Reply from 23.15.90.161: bytes=32 time=80ms TTL=55
Ping statistics for 23.15.90.161:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 64ms, Maximum = 89ms, Average = 79ms