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ExtraDNS accelerates your Internet connection by caching DNS requests.
Whenever you access a page on the world wide web, fetch your E-mail, request a file via FTP or access any other resource on
the Internet, your computer will have to find out the IP number that corresponds to the address of the site you want to access. Each request needs to be sent to your DNS server across your Internet link. Depending on the speed of your connection, other line activity and DNS server load it may take several seconds before a reply is being received. It is but after this reply that your application can actually start loading the requested data. When a web page is being loaded, DNS requests need to be sent for each additional screen element that are part of the page(images, banners etc.) .

What is ExtraDNS doing
ExtraDNS intercepts DNS requests and stores replies in a fast indexed database.
The next time your systems needs to resolve the same address, ExtraDNS instantly supplies the reply from its database.
There are no more delays when loading a Web page or accessing your mail server.
In addition, ExtraDNS overcomes the limitations of the windows operating system and can manage up to 10 different nameserver.

How does ExtraDNS work?
ExtraDNS tells your system to request DNS information from the ExtraDNS application rather then sending requests out to the Internet.

When ExtraDNS receives a request two cases may happen:

1 The answer was found in the database
- ExtraDNS will send the requested information instantly to the application.
- Nevertheless the request will be send to the Internet DNS server.
- Once a reply is received, ExtraDNS will compare the answer with the information in its database, and update any records if required.
This assures that the cache database is always up to date, and you will not receive outdated information from the cache.

2 No matching entry is found in the database
- ExtraDNS will send the request to all available DNS servers that are configured.
ExtraDNS will inquire all servers simultaneously. This will result in a much faster reply compared to the standard windows system where requests are send to the next server only when the previous did not reply.
- Your application will receive the response from the first server to respond.
- ExtraDNS will add the information to its database.