What is DNS Filtering?

DNS filtering is a security technique that uses the Domain Name System (DNS) to block access to malicious or unwanted websites. When a user tries to access a website, their device sends a DNS query to a DNS server to resolve the domain name into an IP address. With DNS filtering, the DNS server checks the requested domain against a list of blocked domains. If the domain is on the list, the DNS server will block the request and prevent the user from accessing the website. This is commonly used to protect users from malware, phishing attacks, and inappropriate content.