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DNS

Description

DNS (Domain Name System) is the system that translates domain names into IP addresses and directs traffic to the right servers. DNS settings are made up of records such as A, CNAME, MX, and TXT records. These records control where your website loads from, where email is delivered, and how various services verify domain ownership. DNS changes can take time to propagate because they are cached across networks. Correct DNS configuration is essential for website uptime, email deliverability, and integrations with tools like analytics, email providers, and third-party platforms.

Why it Matters?

  • Ensures your domain points to the correct website hosting server.
  • Controls email delivery through MX and related records.
  • Enables verification and integrations with third-party services.
  • Reduces downtime risk when migrations are planned correctly.

Key Factors

  • A and AAAA records: Point a domain to IPv4/IPv6 addresses for web hosting.
  • CNAME records: Alias one domain/subdomain to another destination.
  • MX records: Define where email should be delivered.
  • TXT records: Used for verification, SPF, DKIM, and other text-based settings.
  • TTL and propagation: Time-to-live affects how quickly changes take effect across the internet.

Best Practices

  • Keep a record of current DNS settings before changes.
  • Plan migrations with TTL adjustments ahead of time.
  • Use correct MX, SPF, and DKIM settings for email.
  • Verify third-party integrations after DNS updates.
  • Limit DNS access to trusted admins only.

FAQs

What is DNS?

DNS is the system that directs your domain to the correct servers for your website and email.

Why do DNS changes take time?

DNS data is cached across networks. Propagation depends on caching and TTL settings.

What DNS records are most common?

A/AAAA for web hosting, CNAME for aliases, MX for email, and TXT for verification and email authentication.

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