In early December 2024, Microsoft detected a massive malvertising campaign that compromised over 1 million devices worldwide, hitting consumers and companies alike. The source? Illegal streaming sites loaded with malicious ads.
This case makes a strong argument for blocking high-risk websites at work. Illegal streaming portals, shady download hubs, known phishing domains. Few people would defend keeping those open on business laptops. But what about social media, news sites, YouTube, or the dozens of other platforms employees use every day? Lock down everything, and you risk being labeled the office tyrant. Leave it all open, and you hand attackers an easy way in.
In this article, we’ll review whether blocking access to specific websites could benefit your company and how it might be perceived.
Many businesses find it crucial to restrict internet access at work to boost productivity and secure their networks, and cybersecurity services for small business often include web controls like DNS filtering to support that goal. Let's explore the reasons and benefits of such restrictions.
Blocking websites effectively requires a clear strategy. Here’s a comprehensive list of the types of websites your business should consider blocking access to.
Nowadays, having free access to the internet at work can result in decreased productivity and higher risks to security. This is why it's important for businesses to find ways to limit access to certain websites.
By combining technical methods and clear rules, companies can ensure their employees stay on task, and their networks are safe. Here are five easy-to-understand ways to do this.
Method | What it blocks | Where it works | Best for | Admin effort | Main limits |
|---|---|---|---|---|---|
DNS filtering | Domains and IP addresses on the company’s blocklist | Network-wide or device-based with an agent | Both office and remote employees | Low: category-based toggles, quick setup | Can’t block individual pages on an allowed domain |
Web filtering software | Pages matching content categories or policy rules (like social media, entertainment, adult content) | Any device running the software | Office and remote staff (with software installed) | Moderate: requires defining categories and maintaining rule sets | Needs software deployed on each endpoint; can slow browsing if misconfigured |
Router settings | Specific URLs or keyword-matched domains entered manually | Traffic passing through the router | Small teams working in the office | Low to moderate: manual URL/keyword entry | Lists need regular manual updates; no coverage for remote or off-network staff |
Firewall configurations | Specific IP addresses, domains, or traffic patterns | Hardware or cloud-delivered | Primarily on-site teams with the ability to support remote staff if the traffic is routed through a VPN or cloud firewall | Moderate to high: rule creation and ongoing maintenance | Doesn’t cover remote employees unless paired with a VPN or cloud firewall; complex rule sets can conflict |
Browser extensions | Specified websites within a single browser | Individual company-owned devices | Office staff on company-managed devices | Low: configure the settings of the browser | Easy to bypass with a different browser or personal device |
DNS filtering is a powerful approach to prevent access to specific websites. It blocks DNS queries, which is how the internet translates website names into IP addresses.
When a company sets up DNS filtering, it stops these queries for unwanted websites. This means if an employee tries to visit a non-work-related site, the DNS filter will block it.
Think of DNS filtering like a librarian who decides which books are okay to check out. This method inspects the internet's ‘book catalog’ (DNS queries) and only lets through the requests for websites that the company thinks are okay. If an employee tries to visit a banned site, the ‘librarian’ simply says, ‘This book is not available.’
This method is effective not only for blocking certain sites but also for preventing access to malicious or phishing sites.
Web filtering software allows businesses to define which websites are not allowed and enforce these rules across the network. Categories like social media or entertainment content can be restricted.
The software examines the content of web pages and blocks them if they match the prohibited criteria. This ensures employees access only work-related sites.
Routers, especially those for business use, often have features to block specific websites. Administrators can enter URLs or keywords related to unwanted websites through the router's settings.
This method is especially handy for small businesses without the means for more advanced filtering. It’s a bit like making a no-entry list, but it might need updates now and then to keep up.
Configuring firewalls to block websites is like having a guardian at the gate that only lets in traffic that follows the rules set by the business. By blocking specific IP addresses or domains, the admin ensures that only safe and approved content can be entered.
This method, when used with others, strengthens the security. It can be either a hardware or a cloud firewall, so businesses are flexible in protecting the network.
Install browser extensions that block access to specified websites on individual devices. While this method applies at the device level rather than the network, it's a straightforward way to prevent access to non-work-related content on company computers.
Besides technical measures, educating employees about the significance of web filtering and the rationale for blocking certain sites is crucial. This education might include training, policies, or regular reminders about proper internet use at work.
The pattern behind every bypass is the same: the employee moves traffic outside the layer you're filtering. If you only filter at one layer, one workaround is all it takes. The fix is to stack controls so no single trick defeats all of them:
Layering all 4 means that bypassing one control runs into the next. Someone who changes their DNS settings still hits the endpoint filter. Even someone who installs a VPN still gets flagged by the cloud gateway. Yet, none of these layers are effective without a clear policy behind them. Ideally, employees should understand from day one, in writing during onboarding, that circumventing security tools is a policy violation, not a gray area.
Deciding if companies should limit internet access at work is all about finding the right balance. Many companies block websites that are unrelated to work to keep the workplace productive and focused. However, cyber-attacks are a more solid reason.
In July 2023, Google decided to restrict some employees from accessing the internet, except for Google's own sites and a few essential services. This was part of an experiment to see how well blocking access could protect against cyber threats.
As the use of AI tools grows and brings more risks to data privacy, and as companies like Google aim for high-security government contracts, the reasons to restrict internet access become even stronger.
Limiting internet access can be a crucial step for companies that handle sensitive information or want to safeguard national security. It helps prevent unauthorized access to websites, ensuring the company's and users' data stays safe.
A blanket block list applied company-wide sounds simple, but it creates problems fast. For example, a marketing team that can't access Instagram, LinkedIn, or YouTube loses access to the platforms where they publish, run ads, and track competitors. A developer who can’t reach Stack Overflow or GitHub is cut off from the resources they rely on to solve problems in real time. Meanwhile, your finance and legal teams probably have no business reason to visit any of those sites during the workday, and keeping them blocked there reduces risk without slowing anyone down.
So, the principle is straightforward: match restrictions to what each team actually needs. Apply tighter rules to departments that handle sensitive data and rarely need open browsing, like HR, accounting, or legal. And put it all in writing. A clear internet usage policy gives every employee a plain-language explanation of what’s restricted, why it's restricted, and what happens if someone tries to work around the controls.
NordLayer’s DNS filtering by category simplifies how to block employees from accessing websites that could harm your company's network. This system scrutinizes each attempt to visit a website, comparing it to a list of sites that are not allowed. When it finds a website that's recognized as a threat or is already on the blocklist, NordLayer steps in to block access to that website, ensuring your internal network remains secure.
By choosing NordLayer, businesses can control and block access to a website across more than 50 varied categories, all while securing sensitive company data with robust AES-256 or ChaCha20 encryption. This approach offers a comprehensive solution for maintaining productivity and enhancing network security. If you have any questions before getting started, feel free to contact our sales team. They're here to assist you.
Anastasiya Novikava
Cybersecurity Copywriter
Anastasiya is a cybersecurity copywriter with a decade of experience in content marketing. She creates product comparisons, threat research and statistics, white papers, customer case studies, and educational content, with a focus on AI threats, data breach prevention, and compliance frameworks (DORA, GDPR, NIS2).
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