Web filtering encompasses several tools for managing internet access, including DNS filtering, but each serves slightly different purposes and operates in distinct ways. In this blog, we’ll break down their differences, highlight the use cases for each, and provide examples to make it all easy to understand.
Web Filtering vs. DNS Filtering
The main difference between web filtering and DNS filtering, which is a subset of web filtering, is how they restrict access. Web filtering involves blocking or allowing specific websites or content, often based on URLs or domains, and is used to control web browsing. DNS filtering is a specific type of web filtering that focuses on blocking entire domains by analyzing DNS entries before any connection is established.
What Is Web Filtering?
Web filtering is a versatile tool that allows or blocks specific websites, URLs, or even content based on predefined rules. This approach is great for environments needing detailed control over what users can access online. For example, a school might use web filtering software to block social media sites to help students focus on their studies.
Methods of Web Filtering Include:
- URL Filtering: Blocks or allows specific URLs, like
example.com/page1. - Category Filtering: Blocks entire categories, such as “Gaming” or “Adult Content.”
- Content Filtering: Analyzes and blocks specific parts of a website, such as certain keywords or images.
Example: A company uses web filtering to allow access to YouTube for training videos but blocks entertainment content to maintain productivity.
👉 Read our blog which explains web filtering in more detail
What Is DNS Filtering?
DNS filtering, as a form of web filtering, works at the Domain Name System (DNS) level, blocking entire domains before any connection to a website can be made. It acts like a gatekeeper—if a domain is on the blocklist, the connection never happens. Since DNS filtering happens before content is loaded, it’s typically faster and lighter than traditional web filtering.
Example: A family sets up DNS filtering to block adult content across all their devices. When a child tries to visit an inappropriate website, DNS filtering prevents the connection from even starting.
Key Differences Between Web Filtering and DNS Filtering
Real-World Scenarios
Web Filtering Scenario
A workplace blocks social media websites during work hours to ensure productivity. This type of filtering uses URL inspection to control access at a granular level.
DNS Filtering Scenario
A small business uses DNS filtering to block access to phishing domains, safeguarding employees from malicious sites even when using personal devices.
When to Use Web Filtering vs. DNS Filtering
Use Web Filtering If:
- You need detailed control over specific pages or content within websites.
- You’re managing a school or workplace where strict, granular access is crucial.
Use DNS Filtering If:
- You want a quick, easy solution for blocking harmful or distracting domains.
- You’re managing a home or small business network and need straightforward cybersecurity.
Combining Web Filtering and DNS Filtering
In many environments, using both types of filtering offers the best of both worlds.
Scenario 1: A business uses DNS filtering to block known malicious domains and also employs web filtering to restrict access to specific social media sites during work hours.
Scenario 2: A school blocks inappropriate content at the DNS level, while using web filtering to further restrict gaming websites during school hours.
This combination provides broad protection with the ability for fine-grained control, ensuring safety and productivity online.
Conclusion
Web filtering, including DNS filtering, are complementary tools for managing internet access. While general web filtering gives you detailed control over specific URLs and content, DNS filtering offers a simple, effective way to block harmful domains at the DNS level.
Understanding their differences helps you choose the right tool—or combination of tools—for your needs, whether that’s protecting a home, securing a business, or ensuring a productive learning environment.
Using these filtering methods effectively can help create a safer, more productive online experience for everyone. Whether you opt for web filtering, DNS filtering, or both, you’ll have greater peace of mind knowing your internet access is secure and well-managed.
