What Is DNS?

by Priya Nakamura Updated Apr 12, 2026

DNS (Domain Name System) is like the internet's phone book. It translates human-readable domain names (like google.com) into IP addresses (like 142.250.80.46) that computers use to communicate.

How DNS Works

When you type a website address in your browser, your device asks a DNS server to look up the IP address for that domain. The DNS server responds with the IP, and your browser connects to that address. This happens in milliseconds.

Why Change Your DNS?

Your ISP provides DNS by default, but alternatives like Google DNS (8.8.8.8) and Cloudflare (1.1.1.1) can be faster and more private. See our guide to change DNS on your router.

Related Guides

Video Tutorial

For more information, see RFC 791 — Internet Protocol.

Pro Tip: Every device on the internet has an IP address, but thanks to NAT, hundreds of devices can share a single public IP.

Key Takeaways

Private IPs (192.168.x.x, 10.x.x.x) are used inside your home network
DNS translates domain names to IP addresses
DHCP automatically assigns IPs so you don't have to
Your default gateway is your router's IP address

Frequently Asked Questions

What is DNS in simple terms?

DNS translates website names (like google.com) into numbers (IP addresses) that computers use to find each other on the internet.

What DNS server should I use?

Google DNS (8.8.8.8) for reliability, Cloudflare (1.1.1.1) for speed and privacy, or OpenDNS (208.67.222.222) for content filtering.

About Priya Nakamura

Priya is a telecommunications engineer and networking educator at RouterHax. With a background in ISP infrastructure and a Master's in Computer Networks, she explains complex networking concepts in plain English. Priya covers WiFi standards, protocols, IP addressing, and network architecture.