DNS, short for Domain Name System, is the system that translates human-readable website names, like a domain name, into the numerical IP addresses that computers actually use to find and communicate with each other over the internet.

Without DNS, users would need to memorize long strings of numbers for every website they wanted to visit, so DNS functions much like a phone book, letting people use memorable names while computers handle the numerical addressing behind the scenes.

Translating Names Into Numbers

How a DNS Lookup Actually Happens

When you type a website address, your device sends a DNS query that gets passed through a series of specialized servers, each responsible for narrowing down the search, until the correct IP address is found and returned, all typically completing in a fraction of a second.

DNS results are also cached, or temporarily stored, at multiple points along the way, from your own device to your internet provider's servers, which is why repeated visits to the same website usually resolve faster than the very first visit.

Sources

  1. Wikipedia β€” overview of DNS architecture and function
  2. Internet Corporation for Assigned Names and Numbers (ICANN) β€” official background on domain name and DNS governance
  3. Cloudflare β€” technical explainer on how DNS lookups work

FAQ

What does DNS actually translate?

It translates human-readable website domain names into the numerical IP addresses computers use to locate each other on the internet.

Why is DNS often compared to a phone book?

Because it lets people use memorable names for websites while computers handle the actual numerical addressing behind the scenes.

Why do repeated visits to the same website load faster?

DNS results are cached at multiple points, from your device to your provider's servers, so repeated lookups don't need to start from scratch.

About the Author

We reference Wikipedia, Internet Corporation for Assigned Names and Numbers (ICANN), and Cloudflare to explain the background and current understanding of this topic.

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