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What Is DNS?

Understand DNS records, resolvers, and how DNS lookups work.

DNS is the directory layer of the internet. It maps human-readable names like example.com to technical records like A, AAAA, MX, TXT, and CNAME.

Common DNS records

  • A and AAAA for IP addresses
  • MX for mail routing
  • TXT for verification and email policies
  • NS for authoritative nameservers
  • CNAME for aliases