No IPv6? Also, why do we need another one of these? Not to put you down or anything but I usually just run curl icanhazip.com or ipchicken.com.
But you can force IPv6 by using 6.ifcfg.me.
I know there are other services.
What I need the most is getting a short overview about my IP or others:
curl ifcfg.me/all
curl ifcfg.me/google.com