$ dig +short myip.opendns.com @resolver1.opendns.com
104.28.3.70
$ curl -4 ifconfig.co
104.28.3.70

$ dig +short -6 myip.opendns.com aaaa @resolver1.ipv6-sandbox.opendns.com
2400:cb00:2048:1::681c:346
$ curl -6 ifconfig.co
2400:cb00:2048:1::681c:346