update.example.com. I've tested that it works. If I manualy set an IP 1.2.3.4 after ~1min it will change to myPublicIP.update.example.com I get 64 bytes from 104.21.69.88 (104.21.69.88) an IP from Cloudflare but not myPublicIP.myApp to that points to update.example.com.myApp.example.com I get 64 bytes from 172.67.206.191 (172.67.206.191) also an IP from Cloudflare.