What Is Dns Filtering And Why Does Your Business Need It?

As businesses become more reliant on the internet, it is becoming increasingly important to
ensure the security and integrity of their online presence. Malware threats, cyberattacks, and
data breaches have a potent ways to harm the security of your online business. Because of this,
businesses are increasingly turning to DNS filtering to boost their internet security and
safeguard their assets.

A cybersecurity practice called Domain Name System (DNS) filtering prevents users from
accessing websites, domains, or IP addresses that are known to be harmful, inappropriate, or
otherwise undesired. In order for the technology to function, predefined criteria are used to filter
and prevent access to particular URLs or IP addresses. DNS filtering provides a quick and
simple method of preventing access to harmful websites, inappropriate content, and other online
risks, lowering the risk of a security breach and boosting worker efficiency.

Understanding DNS

To enable devices to visit a website, the DNS system converts human-readable domain names
like (www.example.com) into machine-readable IP addresses ( By intercepting DNS
requests made by devices, DNS filtering verifies that they don't come from any known bad or
unsuitable domains or IP addresses. When a match is found, the device is prevented from
accessing the website by blocking its access.

DNS filtering can be applied at several levels, including network level as well as endpoint level,
or even both. Restricting access to websites irrelevant to work is a useful tool for companies
trying to improve their cybersecurity posture, safeguard their data and networks, and guarantee
staff productivity.

How DNS Filtering Works

DNS filtering functions by intercepting and examining DNS requests sent by networked devices.
The DNS filtering system examines the requested domain name against a database of known
dangerous or unwanted domains or IP addresses whenever a device requests access to a

The DNS filtering mechanism then prevents access to the website by returning a fake IP
address or by completely rejecting the request if the domain or IP address is on the block list.
DNS filtering can be accomplished at the endpoint level by installing software on specific

devices that intercept and locally filter DNS requests. It can also be applied at the network level
by setting DNS servers to execute filtering.

Benefits of DNS Filtering for Businesses

Employing DNS filtering offers a number of benefits for your business.

1. Enhanced Productivity

It prevents employees from accessing specific websites, including social media or entertainment
websites, while at work. This can boost output and cut down on distractions.

2. Increased Security

DNS filtering helps shield businesses in a way that blocks access to harmful websites. It also
restricts the download of malware, viruses, and other unwanted content by employees.

3. Regulatory Compliance

DNS filtering assists companies in adhering to legal obligations by, for example, blocking
access to websites that encourage unlawful activity or contain unsuitable content.

4. Cost-Effective

It is a practical corporate option as it is simple and quick to set up. It can be managed via a
cloud-based platform with no installation of hardware or software needed.

5. Customizable

Businesses can tailor their filtering policies using DNS filtering to suit their unique requirements.
They can restrict access to particular websites or groups of websites, or they can grant
particular employees or departments access to particular websites.

Why Does Your Business Need DNS Filtering?

To Protect Your Business from Cyber Attacks with DNS Filtering

Cyber attacks are becoming more frequent and complex in today's digital world, posing a
serious threat to companies of all kinds. Cybercriminals employ a variety of techniques to break
into your network, steal your data, or spread malware that may severely disrupt your company's

But with DNS filtering, you can add an extra layer of protection that works in conjunction with
existing security measures like firewalls, antivirus software, and intrusion detection systems.
This can considerably minimize the risk that your company faces from online threats. Also, you
have complete control over which websites are permitted or restricted in your organization. Not
only is it quite simple to set up, but it can also be customized varying on the needs of your

To Filter Unwanted Content

In a world where anything is just a click away, don't let unwanted content ruin your browsing
experience. It’s a great technique to filter content and block unauthorized access to particular
websites or unwanted content.

If you want to limit access to particular websites within your organization, DNS filtering is all you
need. With DNS filtering, you can wave goodbye to unwanted content and say hello to a safer,
more enjoyable internet.

To Manage Employee Internet Access

Managing employee internet access has become a top priority for many companies as
businesses increasingly rely on the internet to conduct their daily operations. DNS filtering is
one approach to resolving this issue.

Implementing DNS filtering in your organization can help to increase productivity. You can also
reduce distractions and prevent employees from visiting harmful websites. This in turn helps to
mitigate security risks by blocking access to phishing sites, malware, and other harmful content
that could compromise your company's network.

Types of DNS Attacks That Can Target You Without DNS Filtering

You could be vulnerable to different kinds of DNS attacks if you don't use a DNS filtering
solution. These could be:

DNS spoofing/Cache poisoning

Attackers may sabotage DNS responses and drive users to a malicious website, or they may
intercept and change the information sent between the user and the trustworthy website.

DNS Amplification

Attackers may use open DNS resolvers to their advantage in order to magnify their attacks and
overwhelm the victim's network with copious amounts of traffic.

DNS Tunneling

DNS can be used by attackers to get around network security, exfiltrate confidential information,
or carry out remote commands.

Domain Generation Algorithms (DGAs)

Attackers can create a large number of domain names that appear random using DGAs, making
it challenging for security systems to stop or filter them.

DNS Hijacking

Attackers may alter a legitimate website's DNS records or take over a user's DNS settings in
order to route them to a malicious website or intercept their data. DNS filtering service by NordLayer can defend against these kinds of attacks by obstructing access to recognized
malicious sites, removing suspicious traffic, and spotting and responding to odd DNS activity.
The Bottom Line

In the wild west of the digital age, cyber threats are lurking behind every corner, ready to strike
when you least expect it. Employing DNS filtering is one of the best strategies to safeguard your
company against these threats.

All in all, DNS filtering acts as a vigilant guardian for your network, preventing harmful or
unsuitable websites from gaining access. It also ensures the security of your business against
cyber threats, malware, and data breaches. With the growing trend of remote work, the
significance of DNS filtering has only increased, as it offers protection to your business network
regardless of the location of your employees.

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