O'Reilly logo

Online! The Book by Wendy Taylor, Chris Pirillo, John C. Dvorak

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

Domain Name System

The Domain Name System (DNS) is a collection of computers called DNS servers that keep track of what IP address is assigned to what Web site or domain name.

A domain name identifies one or more IP addresses used to identify a Web site. For example, www.cnn.com is a domain name, and it could have multiple IP addresses tied to that name. In other words, it's easier to remember CNN's domain name of www.cnn.com than its IP address of 64.236.16.20.

Your browser can recognize and accept an IP address if you know it.

The DNS translates domain names into IP addresses. Every time you use a domain name, the DNS translates the name into the corresponding IP address. The DNS is a separate network. If one DNS server can't figure out how ...

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required