2026-07-13

Understanding DNS: How the Internet Finds Websites

Understanding DNS: How the Internet Finds Websites

Understanding DNS: How the Internet Finds Websites

Every time you type a website address into your browser, the Domain Name System (DNS) translates that human-readable name into an IP address that computers understand.

Without DNS, browsing the Internet would require remembering numerical IP addresses instead of simple domain names.

How DNS Works

A DNS lookup typically follows these steps:

  1. The browser requests a domain.
  2. The request reaches a DNS resolver.
  3. The resolver contacts authoritative DNS servers.
  4. The IP address is returned.
  5. The browser connects to the web server.

Common DNS Record Types

  • A Record
  • AAAA Record
  • MX Record
  • CNAME
  • TXT
  • NS

Security Risks

DNS attacks include:

  • DNS Spoofing
  • Cache Poisoning
  • DNS Tunneling
  • Amplification Attacks

Conclusion

DNS is one of the fundamental technologies behind the Internet. Understanding how it works helps both network administrators and cybersecurity professionals troubleshoot and secure network communications.