There are many different types of content filtering technologies. CleanBrowsing is a DNS-based content filter that leverages DNS filtering, but how does it differ from other technologies like browser based, application or service based filters?

This article will explore the benefits of DNS-based filtering and why we use it as the foundation of our service offering.

Benefits of DNS-based Content Filtering

There are different types of content filtering because each is designed to serve different purposes. The choice between them depends wholly on an organizations specific requirements and preferences.

We chose DNS, and believe it to be superior for our purposes, because of the following reasons:

• Network-Wide Filtering: DNS-based filters operate at the network level (think your router), allowing you to filter content for all devices connected to the network. This can be particularly useful in a household or corporate environment where you want consistent filtering across multiple devices without having to install individual software apps on each device.
• Device Independence: Since DNS filtering is applied at the network level, it doesn't rely on specific apps installed on devices. This makes it independent of device types and platforms, providing a more uniform filtering experience regardless of whether the user is on a computer, smartphone, or any other connected device.
• Ease of Management: DNS-based filters are typically easier to manage and configure centrally. Changes to filtering settings can be implemented at the DNS server level, making it more convenient for administrators to control and update content filtering policies. They can also integrate seamlessly with Mobile Device Management (MDM) solutions.
• Reduced Resource Usage: DNS-based filtering doesn't require as much processing power and resources on individual devices compared to software apps. This can result in improved overall system performance, especially on older or less powerful devices.
• Scalability: DNS-based filtering can be more scalable, especially in large networks, as it can be implemented at the DNS server level without the need to install and manage software on each individual device.
• Faster Deployment: Implementing DNS-based content filtering can be quicker and more straightforward than deploying and configuring content filtering apps on each device. This can be advantageous in situations where rapid deployment is necessary.
• Affordability: Many other types of filtering technologies can be cost prohibitive, typically tailoring their service for larger enterprises that can afford hefty licenses and subscriptions. Network-based services can dramatically reduce the cost for individuals and organizations alike.

Key Differences Between DNS-Based and Other Filtering Methods

Below is a comparison of how DNS-based filtering stacks up against browser-based, application-based, and service-based filters:

Common Scenarios Where DNS Filtering Excels

DNS-based filtering isn't a one-size-fits-all solution, but it performs exceptionally well in various scenarios:

• Home Networks: Parents can protect children from harmful content across all household devices without needing to configure each one separately.
• Public Wi-Fi Networks: Municipalities can safeguard public Wi-Fi hotspots by blocking malicious sites and enforcing family-friendly browsing rules.
• Corporate Environments: Businesses can enforce uniform content policies across all employee devices, improving productivity and reducing security risks.
• Education Institutions: Schools can maintain consistent filtering on student and staff devices while supporting various device types.
• Transportation Hubs: Airports, bus stations, and train stations can provide secure, filtered internet access to travelers while ensuring compliance with public safety policies.
• Rapid Deployments: Ideal for events, pop-up locations, or disaster response scenarios where a fast, scalable solution is needed.

Challenges of DNS-Based Filtering

While DNS filtering offers several advantages, it does have limitations worth highlighting:

• It lacks the granularity of URL filtering, focusing only on Fully Qualified Domain Names (FQDNs).
• Filtering specific content within a domain (e.g., blocking certain videos on YouTube) requires complementary tools.

DNS-based filtering provides an efficient, scalable, and cost-effective way to secure online environments. While not as granular as other methods, it is versatile enough to meet the needs of households, businesses, and municipalities. For organizations seeking a balance between simplicity and effectiveness, DNS-based filtering remains the preferred choice.