How to Use Cloudflare as Free Dynamic DNS from a Linux Server + How to be a _cron_ artist :: PostApocalyptech — Creating, Inventing, Disassembling, and Destroying Everything Technological https://postapocalyptech.com/posts/use_cloudflare_ddns/
DNS: steveward.me.uk | Cloudflare – Web Performance & Security https://www.cloudflare.com/a/dns/steveward.me.uk
How do I setup a PTR record with my exisiting domain name? | DigitalOcean https://www.digitalocean.com/community/questions/how-do-i-setup-a-ptr-record-with-my-exisiting-domain-name
How to troubleshoot DNS with dig and nslookup https://www.a2hosting.com/kb/getting-started-guide/internet-and-networking/troubleshooting-dns-with-dig-and-nslookup
An Introduction to DNS Terminology, Components, and Concepts | DigitalOcean https://www.digitalocean.com/community/tutorials/an-introduction-to-dns-terminology-components-and-concepts