http://ifconfig.co might satisfy you, works on both http and https for ipv6, no redirect
$ curl -6 http://ifconfig.co 2a02:8011:401d:xx::yy $ curl -6 https://ifconfig.co 2a02:8011:401d:xx::yy $ curl -4 ifconfig.co 52.18.x.x it's quite a handy hostname to use when you want to know your public IP
