What is a DNS Filter?Ī DNS filter uses the DNS to exercise control over the websites that can be accessed on a computer, laptop, tablet or smartphone. Even if multiple servers need to be contacted, the process takes just a fraction of a second. If the website exists, a reply is received with the correct IP address which is passed to the browser.

A query is sent to a recursive DNS server, which then makes contact with other DNS servers to find the web server hosting the domain. When you type in a domain name into your web browser, a DNS lookup is performed. What was needed was a decentralized model that allowed lookups to be performed quickly to match domain names with their IP addresses. The DNS was created to allow the use of alphanumeric domain names rather than IP addresses that are difficult to remember.

In 1983, Mockapetris and his team developed the DNS to support the growth of email communications on the Advanced Research Projects Agency Network (ARPANET), long before the creation of the internet in 1989. The Domain Name System (DNS) is the brainchild of Paul Mockapetris. In this post we explain what a DNS filter is, why DNS filtering is important for cybersecurity, and other advantages of DNS filtering, but first it is useful to explain what the DNS is and why it is essential to the correct functioning of the internet.

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