What is DNS Filtering?

DNS filtering is the practice of using the Domain Name System (DNS) to block access to malicious websites and filter out harmful or inappropriate content. DNS acts as a translator, matching user-friendly domain names (like google.com) to numerical IP addresses (like 209.85.203.138). This process allows users to access websites without needing to remember complex numeric addresses.

DNS filtering plays an essential role in enhancing cybersecurity, acting as a safeguard against various online threats. However, it should be part of a comprehensive security strategy that includes multiple layers of defence to ensure maximum protection.

Why is DNS Filtering Important?

While DNS filtering is a crucial component of an organisation’s cybersecurity strategy, it should not be relied upon in isolation. It often serves as the last line of defence against online threats.

Real-World Scenario

Consider a situation where a phishing email successfully bypasses your email security measures, and the recipient unknowingly clicks a link requesting their username and password. In such a case, a robust DNS filter can prevent the user from reaching the malicious website, thereby protecting their sensitive information and reducing the risk of a data breach.