What is NextDNS and what does it do?

NextDNS is a DNS filtering and policy service that helps block access to malicious or unwanted domains before a device connects to them. It is often used to reduce exposure to phishing, malware, trackers, ads, and other unwanted online destinations across phones, laptops, tablets, home networks, and office environments.

This guide explains what NextDNS is, what it does, how DNS filtering works, where its limits are, and how it differs from broader platforms such as Cloudflare. It is written as an explanatory guide, not as a product recommendation, so the aim is to show where this type of service fits within layered security and where it does not.

This page explains what NextDNS does, how DNS filtering works, what it can and cannot block, and how it compares with broader platforms such as Cloudflare.

Use the links below to jump to the sections most relevant for you.

• What NextDNS is
• How DNS filtering works
• How to check whether your devices are actually using NextDNS
• What NextDNS can help block
• What NextDNS does not do
• Is NextDNS the same as Cloudflare
• Where NextDNS fits in layered security
• Common questions about NextDNS
• Practical guidance for real environments
• Related guides
• Further Guidance and Support

NextDNS is a DNS filtering and policy service. In simple terms, it sits at the stage where devices ask for the network address of a website, app service, or online platform. Because of that position, it can block certain connections before the device reaches the destination.

This makes it different from tools designed mainly for website delivery, content caching, or application acceleration. NextDNS is primarily about DNS level control, filtering, and visibility rather than CDN performance or broader edge platform features.

When a phone, laptop, browser, or app connects to an online service, one of the first steps is usually a DNS lookup. That lookup translates a name such as a website or service address into the network location the device needs in order to connect.

A DNS filtering service reviews that request against policies and block rules. If the requested domain matches a blocked category or custom rule, the connection can be stopped at that stage. This is why DNS filtering can reduce exposure to known malicious destinations, tracking domains, ad related domains, and other unwanted services without needing to inspect the whole webpage itself.

Many people assume that once NextDNS is configured on a router, phone, laptop, or browser, every DNS request will automatically use it. In practice, that is not always the case.

A device may use DNS settings supplied by the router, manually configured DNS settings on the device, browser based secure DNS behaviour, or operating system features such as encrypted DNS. Some devices may use one DNS path on the home or office network and another when moved elsewhere. This can lead to situations where filtering appears to work on one device but not another.

It is also important to distinguish between the DNS server shown on the device and the DNS infrastructure ultimately used upstream. For example, a computer may show the local router as its DNS server because the router is acting as the immediate resolver for devices on the network. The router may then forward those requests to NextDNS or to another upstream DNS provider. An external DNS checker may therefore show public infrastructure involved in processing the request rather than the simple product name the user expected to see.

In some environments, the router may still advertise the ISP’s DNS settings, while an individual phone, laptop, browser, or operating system uses a different DNS path. This can happen when DNS is configured manually on the device, when a browser uses Secure DNS, or when Android Private DNS or similar encrypted DNS features are enabled.

This is why DNS filtering should be checked from more than one place. The router settings may show one DNS path, the operating system may show another, and the NextDNS logs may reveal which devices are actually reaching the policy. These differences do not always mean the configuration is broken. They often show that DNS is being handled at more than one layer.

This is one reason DNS filtering can seem inconsistent when it is actually the deployment method that differs. A router level deployment, a device level deployment, browser secure DNS settings, and mobile network behaviour can all affect the path taken by DNS queries.

In practice, if you want to confirm whether NextDNS is really being used, it is often better to check more than one source. Local device settings, router configuration, browser settings, and NextDNS logs may each reveal a different part of the picture. Together they provide a more reliable view than any single external checker on its own.

An external DNS checker can sometimes help, but it is important to remember that such tools may show upstream public DNS infrastructure rather than only the product name or local DNS server a user expects to see.

NextDNS can help block a range of domain based destinations that are commonly associated with security, privacy, or content control concerns. The exact result depends on the chosen policy settings, filter lists, and how the service is deployed.

It may help block domains associated with:

malware delivery
phishing related infrastructure
tracking and analytics domains
advertising networks
cryptojacking related domains
newly registered or suspicious domains
other unwanted categories controlled through filtering policies

This is one of the main reasons people compare NextDNS with standard public DNS resolvers. Many users are not simply asking for name resolution. They are asking for filtering, visibility, and policy control as well. This is one of the main reasons people compare NextDNS with standard public DNS resolvers. Many users are not simply asking for name resolution. They are asking for filtering, visibility, and policy control as well.

This section is important because DNS filtering is useful, but it is not the same thing as complete security. A page like this should set clear boundaries so that the reader understands where the technology helps and where other controls are still needed.

NextDNS does not:

replace endpoint protection or antivirus
inspect the full contents of a webpage the way a browser security tool or secure web gateway may do
accelerate websites like a CDN
replace backups
replace software patching
replace identity protection or phishing resistant sign in controls
guarantee that every malicious destination will always be blocked

Setting these limits clearly helps avoid treating DNS filtering as a complete security solution.

No. These services can overlap in some DNS related areas, but they are not mainly solving the same problem.

NextDNS is primarily a DNS filtering and policy service. It is usually considered when the goal is to control or filter what devices can connect to at DNS level, often for privacy, security, parental control, or policy reasons.

Cloudflare is a much broader platform. Depending on the product used, it may be involved in authoritative DNS, website and application delivery, CDN caching, DDoS resilience, traffic handling, and related edge services. That means a comparison can be useful, but it should not assume the two are direct substitutes in every situation.

NextDNS is best understood as one layer within a broader security approach. It can reduce exposure to some malicious or unwanted destinations early in the connection process, but it should not be treated as the only protective control in an environment.

In a real organisation or home office, DNS filtering may sit alongside browser hardening, endpoint protection, software updates, secure sign in controls, email protection, backups, network segmentation, and firewall rules. This follows the general security principle that protection should be implemented in layers rather than relying on one control.

NextDNS can improve privacy and reduce exposure to some malicious destinations, but any cloud based DNS service still depends on trust, configuration choices, and the user’s own threat model. Privacy, logging, and trust are common questions when using any cloud based DNS service.

It can help block domains associated with malware delivery, tracking, advertising, and other unwanted categories at DNS level. The result depends on the chosen filters, deployment method, and whether the connection relies on a domain that can be blocked at that stage.

No. DNS filtering works mainly at domain level, not at the full page path or full content level. That is an important limitation to explain clearly.

Yes. It can be deployed in different ways, including per device and at router level, but the behaviour and visibility can vary depending on how the network is configured. Router setup, linked IP configuration, Android Private DNS, and device visibility are common areas where users can become confused.

Yes. In some environments they address different layers. Cloudflare may be used for website or application delivery, while NextDNS may be used to filter outbound DNS requests made by users or devices.

The most suitable deployment depends on what is being protected and how much control is needed. A single laptop or phone may be configured differently from a home router, a travelling user, or a small office network.

Where an ISP router does not allow DNS settings to be changed, device level DNS configuration may still provide protection for individual devices. For managed business environments, however, relying only on manual device settings can become difficult to maintain. Router, firewall, mobile device management, browser policy, and NextDNS logs may all need to be reviewed together.

In practice, the most important questions are usually these:

Is the goal privacy, malware reduction, ad and tracker blocking, or policy control
Will the filtering be applied per device or at network level
Is visibility needed per device or only for the whole network
Will users move between office, home, and mobile networks
Is the environment already using other services such as Cloudflare, Microsoft Defender, or firewall based controls

Those are more useful questions than simply asking whether NextDNS is good or bad. The real answer depends on scope, deployment method, and what other layers already exist.

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Author
Elías Sánchez
IT Support Consultant
Evening Computing
London, United Kingdom

This guide was prepared by Elías Sánchez with research and drafting assistance from AI tools. All technical content has been reviewed and adapted for clarity and accuracy.

Last reviewed
07 May 2026