To add or change DNS servers you have to open Windows Network settings and edit the DNS server addresses of your network card or ISP connection shortcut. This makes switching DNS servers frequently a bothersome task, particularly when the DNS server settings are to edited on the network card. If the DNS server addresses are stored in the connection shortcut you can just create multiple shortcuts with different DNS server settings, like I do. But you can’t have different DNS server settings on your network card at the same time.
Public DNS Server Tool is a small utility that makes it possible to change the DNS servers in Windows XP, Vista and 7 on the fly, and thus save you from going the long winded route.
Public DNS Server Tool comes with a collection of preset public DNS servers – Google DNS, OpenDNS, Norton DNS, ScrubIT DNS and DNSAdvantage. You can either choose any of these pairs of DNS servers or set the DNS servers manually.
After you have chosen a DNS server and selected the network card, click on Change to apply the settings.