In a similar vein, I use `dig` with Cloudflare to find IP addresses:
dig @1.1.1.1 ch txt whoami.cloudflare -4 +short | sed "s/\"//g"
dig @2606:4700:4700::1111 ch txt whoami.cloudflare -6 +short | sed "s/\"//g"
dig @1.1.1.1 ch txt whoami.cloudflare -4 +short | sed "s/\"//g"
dig @2606:4700:4700::1111 ch txt whoami.cloudflare -6 +short | sed "s/\"//g"
nslookup myip.opendns.com. resolver1.opendns.com