DNS cache - tool for finding addresses of Internet hosts

 When a browser wants to contact www.debian.org, it first asks a DNS
 cache, such as dnscache, to find the IP address of www.debian.org.
 .
 Internet service providers run dnscache to find IP addresses
 requested by their customers. If you're running a home computer
 or a workstation, you can run your own dnscache to speed up your web
 browsing.