How to test IPv6 and IPv4 web server?

THpubs asked:

I have setup a web server (Nginx) and assigned an IPv4 address and an IPv6 address to it. In the DNS I have set an A record and an AAAA record. Now, I need to check whether its working. I need to check whether an IPv6 only client can view my site. Whether an IPv4 only client can view the site (I think IPv4 only clients can view because im IPv4 ).

How can I do this? I only have IPv4!

My answer:

The online validator at can test your Web site for IPv4 and IPv6 connectivity.

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