DNS

https://messwithdns.net

https://www.cloudflare.com/learning/dns/what-is-dns/

Domain Name System (DNS) 101 Miniseries (Adrian Cantrill) - https://www.youtube.com/playlist?list=PLTk5ZYSbd9MhMmOiPhfRJNW7bhxHo4q-K - https://twitter.com/adriancantrill/status/1577568458912501763

https://github.com/bregman-arie/devops-exercises/blob/master/topics/dns/README.md

https://dnsimple.com

https://github.com/mr-karan/doggo - https://doggo.mrkaran.dev/docs/ - https://news.ycombinator.com/item?id=40847699

(unmaintained) https://github.com/ogham/dog - https://dns.lookup.dog/

dig

https://en.wikipedia.org/wiki/Dig_(command)

https://digwebinterface.com

dig example.com

dig example.com A
dig example.com CNAME
dig example.com MX