The Domain Name System (DNS) is the system that allows us to navigate the web using easy-to-remember domain names, such as, rather than typing in difficult-to-remember IP addresses, such as When a domain is purchased, it can be assigned to an IP address of a web server hosting a website. Whenever we open a web browser and attempt to connect to a website, we type in the domain (EX., and a DNS query initiated. Your DNS server will then look up the IP address of the domain, which will allow your browser to make a connection to the IP address of the website and the site is displayed.

DNS Filtering is a service which adds an extra layer of security to the network through blocking sites which are known to deliver viruses, malware, ransomware, as well as blocking specific, pre-set, web content such as adult content, social media, gambling, etc. The DNS filter will only allow DNS query’s if the website’s domain is not known to be malicious, or part of a content category which is set to be restricted. The filter administrator has the ability to adjust the filter settings and create restriction policies on content categories that are to be blocked. If a website is found to be either malicious or part of an undesirable content category, then a pre-set webpage will display a message explaining the reason for blocking.

DNS filtering is a quick and easy layer that you can add to your security stack in order to prevent users from accidentally navigating to malicious websites. With a DNS filter set up on the network, a large majority of online threats can be blocked before any possibility of compromise.  

Please contact Plummer Slade directly if you have any questions or are interested in learning more about DNS Filtering.

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