What is DNS and How Does It Work?

DNS: The Internet's Address Book

Every website on the internet has an IP address (like 142.250.80.46). But humans remember names, not numbers. DNS (Domain Name System) automatically translates domain names like google.com into the IP addresses computers use to communicate.

How DNS Resolution Works

When you type a URL, your device follows a chain of lookups to find the correct IP address:

1. Your browser checks its local cache — it may have resolved this name recently.
2. If not cached, the query goes to your operating system, which checks the local hosts file and then your configured DNS resolver (usually your ISP's server or a public DNS like 8.8.8.8).
3. The recursive resolver queries root nameservers to find the authoritative server for the top-level domain (.com, .org, etc.).
4. The TLD nameserver points to the authoritative nameserver for the specific domain.
5. The authoritative nameserver returns the IP address.
6. Your browser caches this result and connects to the IP address.

Why DNS Speed Matters

Every website visit starts with a DNS lookup. A slow DNS resolver adds latency to every page load. Many users improve browsing speed by switching to a faster public DNS server.

Alternative DNS Servers

• Cloudflare (1.1.1.1): The fastest resolver in independent benchmarks. Privacy-focused — does not log IP addresses.
• Google (8.8.8.8): Fast, reliable, globally distributed.
• OpenDNS (208.67.222.222): Offers optional content filtering and parental controls.
• Quad9 (9.9.9.9): Blocks malicious domains automatically.

Changing Your DNS in the Router

The most effective way to change DNS for your entire network is to update the DNS settings in your router's admin panel. Log in to 192.168.1.1 (or your router's IP), find the DNS settings under WAN or DHCP settings, and enter the preferred DNS server addresses.