Why Your School Needs Web Filtering Right Now

What is Web Filtering

Web filtering is a number of techniques allowing its users to block web pages and entire sites by preventing internet browsers from loading the pages and websites. Each technique is based on a specific internet protocol.

Based on the DNS (Domain Name System) protocol, DNS filtering is one such technique. DNS filtering is the most reliable and comprehensive technique for blocking malware and phishing, explicit and pornographic sites – any content educators and parents find dangerous and would like students to avoid in an educational environment.

What differentiates DNS filtering from other filtering techniques is that it blocks unencrypted/HTTP and encrypted/HTTPS sites equally well. The latter dominates the internet and the popularity of HTTPS sites grows by the day. The SafeDNS web filtering solution for schools is DNS-based and filters HTTPS and HTTP internet traffic just fine.

There are web filters that analyze the content of web pages, looking for certain key words. If on the page the filter finds the key words that users have marked as inappropriate (rude, vulgar, etc.), this page is blocked.

Another way for web filters to determine what content a website has, is to look for such information in the filter’s database of categorized websites. In such a database, sites are distributed into 1 or several content categories. Users of this kind of web filtering solutions choose among the categories which to block or allow. SafeDNS provides this type of web filtering, based on its own exceptionally precise, dynamically updated web categorization database.

With a database of 105M sites in 60 content categories to choose from, SafeDNS users set the filtering rules they find necessary for pupils, students of different age, staff members and school administrators. Sites from unwanted content categories, blocked by the users, will never be accessible on their networks. Per-policy exceptions from filtering rules are of course available for the SafeDNS users.

Why there is a necessity for web filtering at school

To get access to an almost unlimited wealth of online educational resources, teachers and students all over the world connect to the internet many times a day. But keep in mind that web connection is a double edge sward. On the one hand, it can bring inspiration, enlightenment, academic knowledge, and lots of new exciting ideas.

On the other hand, an unfiltered internet is a kind of the Wild West. It is full of bad stuff – porn, child abuse content, malicious and phishing sites. The educators, ignoring this hard truth, do that at their own peril. Leaving the students one on one with an unfiltered internet may cause a range of problems. Let's take a look at what issues the educators can solve with a high quality web filtering.


In some countries schools must comply with the regulation and government-issued recommendations, concerning protection of under-age children against harmful content on the internet. Children’s Internet Protection Act (CIPA) in the US is a good example. US schools and libraries subject to CIPA must have a filtering solution in place to get discounts offered by the E-Rate program, making technology more affordable for eligible schools and libraries. SafeDNS provides the educators with a web filtering service which can be fine tuned to very strict regulation requirements.

Child and adult (sexual) abuse material is extremely gross and is illegal in most countries. No grownup and kid should ever see such heinous stuff. Ask your web filtering vendor if it puts a special emphasis on blocking child and adult sexual abuse, terrorism-related and other illegal content. If not, think again how useful for your school this web filter is.

To help its users easily block child sexual abuse images and videos, SafeDNS has 2 filtering categories, fully dedicated to such content. One of these 2 categories contains illegal resources from a list compiled by Internet Watch Foundation. SafeDNS receives the list as IWF Member.

A similar category contains child sexual abuse material from a list maintained by the Canadian Centre for Child Protection, as part of its Project Arachnid (protectchildren.ca/en/programs-and-initiatives/projectarachnid). SafeDNS supports this project as the company works to safeguard web surfers from heinous stuff online as well as contribute to preventing distribution and sharing child abuse material online and prevent re-victimization of survivors.

Extremist and terrorism-related content poses a huge threat to young minds. When choosing a web filter, make sure it blocks sites with this content. SafeDNS adds a list of sites, compiled by Counter Terrorism Internet Referral Unit run by the Metropolitan Police, UK to a filtering category, named 'Hate & Discrimination'.

For school IT and educators in Germany it is important to block sites, provoking violence, crime and racial hatred from a list, maintained by Germany's Federal Department for media harmful to young persons (BPjM). Those web filtering solutions which block the listed sites will come in handy to the German educators, otherwise – not so much. SafeDNS includes the sites from this BPjM list into a separate category named ‘German Youth Protection’.

Protecting students against porn and adult content

Teachers and parents want to prevent the nightmare scenario when students see pornographic and adult-only content online. The children often come across it, without even actively seeking such content on the internet. Porn sites are sometimes disguised as innocuous ones. There’s no way of knowing in advance, what material an unfamiliar site contains. That is why it is so important to have web filtering in place. It will block the unwanted content before it’s loaded in the web browser.

Pornographic banners can all of a sudden pop up out of nowhere. By blocking porn and adult sites, a web filtering solution safeguards children from the gross stuff and provides responsible adults with a peace of mind. SafeDNS does a great job of filtering out porn and adult sites. According to the 2018 tests by AV-Comparatives, an independent test lab, SafeDNS blocks near-perfect 98.3% of requests to adult content.

To extend explicit content protection, make sure the web filter, you have chosen for your educational institution, blocks online ads. They can be annoying as well as contain inappropriate images. Besides, the web ads are often used to distribute malicious payloads. With that, we have come up to the other very important reason for the educators to deploy web filtering on their networks.

Leaving no chance to malware and phishing

Malware infections can be crippling for any educational institution, especially if it has limited resources for defending itself from cyber threats. The less experienced web surfers are in your school, the higher such risks. Web filtering is a great means to minimize risks of infecting web-connected devices and entire networks with malware. To double the anti-malware efficiency, use the web filter together with an antivirus.

Phishing is no less of a problem. School staff and students can easily be lured to click on phishing links, allowing phishers to get their hands on personal and organization’s information. Successful phishing attempts can lead to multiple unpleasant consequences – from an identity theft, user credential theft for illegitimate logging into personal and corporate accounts on any kinds of sites, including those of banks. This can result in loss of money and reputation.

Enabling Safe Search for Google, Bing and YouTube

To prevent the students from finding inappropriate content, intentionally or not, via online search, high quality web filters have an option to enable SafeSearch Mode for popular search engines right in the filter’s management panel. SafeDNS provides its users with this useful option for Google and Bing. For the educators and school IT, SafeSearch is quite a beneficial option and we recommend using it network-wide.

Make sure your students do not see the YouTube videos, flagged by viewers as inappropriate. Some web filtering solutions allow users to enable YouTube Restricted Mode. Using this filtering feature is pretty wise as the popularity of YouTube with the young people is legendary. With SafeDNS, the educators can easily switch YouTube Restricted Mode and SafeSearch Mode on, further improving protection of the children.

Limiting access to online time wasters