New ISP for me, apparently using ipv6, but I don't fully understand ...

So, today we switched ISPs. We had Verizon (Frontier) FiOS, and switched to Time Warner (Spectrum). When I go to the following website, it shows an ipv6 address:

http://whatismyipaddress.com/

But when I go to this website it's showing an ipv4 address:

http://www.myipaddress.com/show-my-ip-address/

On my production server, if I look at $_SERVER['REMOTE_ADDR'], it shows the ipv4 address that the second website shows.

So, what's going on here? Why the ipv6 to ipv4 conversion? (if that's what it is).

I guess it doesn't really matter, because everything still works, but I was kind of hoping that I was going to get to test some of my code with this ipv6 internet I now have.

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