DNS filtering blocks access to known risky websites before the page loads. It is one practical layer in a wider cyber security setup, helping reduce exposure to phishing pages, fake login sites, malicious adverts and risky downloads. Drakos Systems provides DNS filtering as part of managed IT support and cyber security for Northern Ireland businesses.
Ask about DNS filtering for your business
Drakos Systems can add DNS filtering to your network, devices or managed IT support package. Belfast based, supporting businesses across Northern Ireland.
Every time a device visits a website, it first asks a DNS (Domain Name System) server to translate the website address into an IP address. DNS filtering adds a check at that stage. If the domain being requested appears on a blocklist of known risky, malicious or unwanted sites, the request is blocked before anything loads.
The key point is that the block happens before the page is served. The device never actually reaches the risky site. This is different from antivirus software, which scans files and content after they have been downloaded.
DNS filtering blocks access to known risky websites at the domain lookup stage, before the page loads. When a device tries to visit a website, it first asks a DNS server for the address. DNS filtering checks whether that domain is on a blocklist. If it is, the request is blocked before any content is loaded.
Risky domains blocked before loading
Fake login pages designed to steal Microsoft 365, bank or supplier credentials. DNS filtering can block known phishing domains before staff reach the login screen.
Some adverts served by compromised ad networks attempt to redirect users to malicious sites. DNS filtering can block the ad-serving domains associated with known bad actors.
Sites associated with malware, cracked software or bundled installers can be blocked at DNS level, reducing the chance of staff accidentally downloading something harmful.
Some ransomware and malware communicates with external control servers. DNS filtering can block known command-and-control domains, potentially disrupting an active attack.
Domains that closely resemble trusted suppliers or services, used to trick staff into thinking they are on a legitimate site. Blocklists include many known typosquatting and lookalike domains.
Beyond security, DNS filtering can restrict categories of site such as gambling, social media or adult content during work hours, depending on the business's requirements.
DNS filtering is one layer, not a complete solution on its own. It works best alongside:
No single tool stops everything. Drakos Systems can help businesses build a layered approach that is practical for the size and risk level of the organisation.
DNS filtering can be extended to remote workers in some setups. Device-based agents can apply the same filtering rules to a laptop or phone working outside the office network, such as at home or on a public Wi-Fi connection. The right approach depends on the devices, operating systems, existing software and the management tools already in use. Drakos Systems can advise on what is practical for your setup.
A useful DNS filtering service should provide clear reports showing which domains were blocked, when, and on which devices. This can help identify:
DNS filtering works well as part of a broader managed IT and cyber security package. Drakos Systems can combine it with:
Tell us how many devices you have and we will explain what DNS filtering would add to your current setup and what it would cost.
DNS filtering blocks access to known risky websites at the domain lookup stage, before the page loads. When a device tries to visit a website, it first asks a DNS server for the address. DNS filtering checks whether that domain is on a blocklist. If it is, the request is blocked before any content is loaded.
DNS filtering can help block phishing pages, fake login sites, malicious adverts, risky download domains, ransomware distribution sites and domains pretending to be trusted suppliers. It can also be configured to restrict access to categories of website such as gambling or social media during work hours.
No. DNS filtering is one layer of protection. It works alongside antivirus, email security, staff phishing training, MFA, firewall rules and good IT support. No single layer stops everything. The aim is to reduce risk across multiple points.
It can be used in some remote working setups, depending on the device, network configuration, software and agreed management approach. Some DNS filtering services offer agent-based protection for devices working off the main network.
Yes. Most DNS filtering services provide reporting that shows which domains were blocked, when, and on which devices. This can help identify risky browsing patterns and support staff training or policy decisions.
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