Learn
Learning Center — NsLookup.io — set of articles on DNS, record types, email & dns, domain names, operations, security and command line tools (nslookup).
How DNS works. What is DNS? Learn how step by step. — a colorful comic to explain DNS.
New talk: Learning DNS in 10 years by https://jvns.ca including some details on how to use wireshark.
Tools
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Doggo “Command-line DNS client for humans”, written in Go. Has human-readable, color coded console output. Has json output. See also dog; doggo is dog + go.
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shovel.report (showing report for this domain.)