Dig
Dig (Domain Information Groper) is a command-line network administration tool used for querying Domain Name System (DNS) servers. It performs DNS lookups and displays the answers returned from the name servers, providing detailed information about DNS records such as A, MX, NS, and TXT. It is widely used for troubleshooting DNS problems and verifying DNS configurations.
Developers should learn Dig for debugging and verifying DNS configurations in web applications, cloud deployments, and network infrastructure. It is essential for diagnosing DNS-related issues like domain resolution failures, mail server misconfigurations, or CDN setups. Use cases include checking DNS propagation, testing DNSSEC validation, and automating DNS queries in scripts.