DNS security: How it protects your network from threats

Key takeaways

• DNS security helps protect the system that directs people to websites and other online services.
• Different tools do different jobs. Some check that DNS information is accurate, while others block known harmful websites.
• You can start by securing your domain account, checking your DNS settings, and asking your provider what protections are available.

When you type a website address into your browser, the Domain Name System (DNS) helps your device find that site. If someone interferes with DNS, they may send you to a fake website or make a real one hard to reach.

This can happen without you noticing. In a 2026 attack documented by Microsoft, attackers changed the DNS settings on some home and small office routers. They could then redirect certain requests through systems they controlled.

You don’t need to be a technical expert to take DNS security seriously. This guide explains what it is, how it works, and which steps can help protect your business.

What is DNS security?

DNS security means protecting DNS from false information, unwanted changes, and attacks that interrupt service.

Think of DNS as a contact list for the internet. You enter a name, such as example.com, and DNS helps your device find the address needed to connect to that website. If an attacker changes the information or interferes with the lookup, you might end up somewhere else.

For a business, DNS security covers two common needs. The first is protecting your own domain, so visitors can reach your website and email. The second is protecting your team’s devices, so they are less likely to connect to known harmful websites.

Key components of DNS security

Different protections help with different problems:

• DNS Security Extensions (DNSSEC): DNSSEC helps check that DNS information from a signed domain has not been changed. It uses digital signatures, which work as a way to verify where the information came from.
• DNS filtering: This can block a device from connecting to domains known to be used for phishing, malware, or other harmful activity.
• Threat intelligence: This is information about known and emerging threats. A DNS filtering service can use it to update the domains it blocks. For example, if researchers find a new website spreading malware, the service may add it to its blocklist.
• DNS monitoring: This helps spot unusual requests. If a device repeatedly tries to reach suspicious domains, an alert may tell you to investigate.
• DNS firewalls: These apply rules to DNS requests, such as blocking certain domains. The available rules depend on the service.
• Encrypted DNS: Methods called DNS over HTTPS (DoH) and DNS over TLS (DoT) make DNS requests harder for someone to read or change while they travel between your device and its DNS service.

No single tool covers every threat. DNSSEC, for example, can help check DNS information, but it cannot tell you whether a website itself is safe.

Why is DNS security important?  

Your website, email, and many online tools rely on DNS. If something goes wrong with it, customers may have trouble reaching you.

DNS security can help because it:

• Makes it harder for attackers to send people to the wrong address using false DNS information.
• Can block access to some known phishing and malware websites.
• Helps you spot unusual activity that may need attention.
• Helps you catch or prevent unwanted changes to your domain settings.
• Supports reliable access to your website and email when paired with a dependable DNS provider.

These protections lower your risk. They cannot guarantee that every website is safe or that your services will never go offline.

How does DNS security work? 

Let’s break it down into simple steps:

1. Your device asks where to find a website: When you enter a web address or click a link, your device asks a DNS resolver for the website’s internet address. A resolver is a service that looks up this information and sends an answer back.
2. Security tools check the lookup: DNS filtering may block the request if the domain is known to be harmful. If the domain uses DNSSEC, a resolver that supports it can check whether the DNS answer has been changed. Monitoring can flag unusual requests for someone to investigate.
3. Your device uses the answer to connect: If the request is allowed, the resolver returns an answer and your device can try to open the website.

For example, if an employee clicks a link to a known phishing site, DNS filtering may stop the lookup before the site opens. A new phishing site might not be on the blocklist yet, so it’s still important to check unexpected links and keep devices updated.

What are the benefits of DNS security?  

DNS security reduces risk, protects users, and improves how your network operates. Below is a clear overview of the core benefits, structured for quick scanning:

• Protection against cyber threats
• Enhanced network performance
• Data integrity and confidentiality
• Typo correction
• Faster lookup

Protection against cyber threats

Solid DNS security safeguards your website against various threats, such as: 

• Phishing: Strong DNS security prevents domain spoofing and ensures users connect to legitimate websites, which prevents phishing attempts that can steal credentials. 
• Malware and ransomware: DNS security blocks access to known malicious domains associated with malware distribution and command-and-control servers, which stops infections before they occur. 
• Botnet protection: Botnets rely on constant communication with control servers to stay active. DNS filtering cuts off that channel by blocking known botnet domains, which weakens coordinated attacks like DDoS floods and large-scale spam.
• Data exfiltration: Attackers often sneak stolen data out through unusual DNS requests. DNS monitoring flags these abnormal outbound queries early, giving you a chance to stop quiet data leaks before damage spreads.
• Spoofing: Spoofing works by tricking users into trusting fake DNS responses. DNSSEC stops this by validating responses with cryptographic signatures, so traffic reaches the real destination instead of an attacker-controlled site.
• Malware hosting: Many attacks depend on domains that host malicious files. DNS security blocks access to these domains, which lowers risk even when users click unsafe links or open compromised content.

Enhanced network performance

A well-protected DNS improves your website’s performance and leads to: 

• Reduced downtime: Preventing DNS-based attacks that disrupt name resolution ensures continuous service availability and minimizes costly downtime. 
• Optimized resolution speeds: Secure DNS resolvers often use advanced caching and routing techniques, which leads to faster domain name resolution and quicker access to online resources. This directly improves the user experience. 
• Load balancing and redundancy: Many secure DNS solutions incorporate load balancing across multiple servers and redundant infrastructure, which ensures high availability and optimal performance even under heavy traffic or localized failures. 
• Increases visibility: DNS logs provide early insight into unusual traffic patterns, compromised devices, and attempted connections to malicious domains.
• Supports compliance: DNS security supports security controls tied to data protection and access monitoring requirements found in common regulatory frameworks.

Data integrity and confidentiality

DNS security protects the accuracy and privacy of your DNS traffic. DNSSEC verifies DNS records during transmission so attackers cannot alter responses in transit. Encrypted DNS protocols prevent outsiders from reading or modifying DNS queries, which keeps browsing activity private. As a result, users reach the correct destination without interference from third parties or traffic redirection.

Typo correction

DNS security tools centralize DNS management, which reduces human error during record updates. Automated validation checks DNS entries before deployment, helping you avoid broken records that lead to outages, failed connections, or traffic sent to the wrong destination.

Faster lookup

A secure DNS server often speeds up lookups because it runs on optimized infrastructure built for high-volume queries. It uses smart caching to store frequent results closer to your users, so repeat requests resolve faster. It also relies on globally distributed networks and efficient routing to reduce latency. When DNS security blocks malicious domains at the DNS layer, your network avoids wasted connections and timeouts caused by unsafe destinations, which helps pages load more consistently.

What are the types of DNS attacks? 

While DNS security can help protect your network, it’s also important to understand the different ways attackers exploit DNS. Here are the common DNS attack types and how they affect users.

• DNS poisoning: It’s an attack where criminals slip fake DNS records into a resolver’s cache. Users type a real domain but land on a phishing or malware site, such as a bank lookalike page that steals logins.
• DDoS attack: In DDoS attacks, large volumes of traffic overwhelm DNS servers until they stop responding. Users see slow loading, errors, or full outages when websites and apps cannot resolve.
• DNS tunneling: This method uses DNS queries as a hidden channel to move data. Attackers can extract sensitive information from a network or send malware commands while the traffic blends in with normal DNS activity.
• DNS hijacking: In this scenario, attackers modify the DNS settings on a device, router, or DNS server to redirect traffic. Users get pushed to fake destinations even when they enter the correct URL.
• DNS amplification: It’s a DDoS technique that turns small spoofed DNS requests into much larger responses. The victim gets flooded with traffic they never requested, causing slowdowns or downtime.
• NXDomain attack: This attack spams DNS servers with lookups for domains that do not exist. The resolver wastes resources processing failed requests, which slows down DNS for legitimate users.
• Phantom domain attack: Instead of using non-existent domains, attackers use domains that respond slowly or not at all. Resolvers get tied up waiting, so real users experience delays and timeouts.
• Subdomain takeover: This happens when an unused subdomain still points to a removed third-party service. Attackers claim the service and host malicious content on a trusted-looking subdomain, which increases the chance users click.
• Domain generation algorithms (DGAs): Some malware automatically creates many possible domain names until it finds one it can use to contact an attacker. The changing names make it harder to block.
• Fast flux attack: In this technique, the domain’s IP address changes constantly to hide malicious infrastructure. It helps phishing and malware sites stay online longer and avoid being taken down.
• DNS rebinding: This attack tricks a browser into treating an internal network target as if it were allowed. A user can visit a malicious page and unknowingly give it a path to probe local devices or services.
• Domain shadowing: Attackers compromise a real domain and quietly create many subdomains for malicious campaigns. Users trust the parent domain, so the links look legitimate and are easier to abuse.

For a deeper walkthrough, see our guide on DNS attacks and how to mitigate them.

What are the best DNS security practices?  

Strong DNS security depends on consistent, practical controls rather than one-time fixes. Here are some practices you can apply to protect DNS at its most exposed points, reduce attack impact, and improve visibility so issues surface early.

• Use Domain Name System Security Extensions (DNSSEC): Enable DNSSEC at your domain registrar and validate it on your DNS resolvers. This ensures DNS responses are authentic and unchanged, which prevents attackers from injecting fake records and redirecting users through DNS poisoning.
• Enable a DNS firewall: Turn on a DNS firewall to block known malicious and high-risk domains before connections occur. This stops phishing, malware downloads, and command-and-control traffic at the DNS layer, reducing exposure even when users click unsafe links.
• Monitor DNS activity: Actively monitor DNS queries and response patterns across your network. This helps surface early signs of attacks such as tunneling, botnet communication, or misconfigured systems before damage spreads.
• Filter malicious domains: Apply domain filtering based on reputation, category, and age. Blocking newly registered or low-trust domains reduces the chance of users reaching phishing pages or malware hosts commonly used in attacks.
• Update software and systems regularly: Keep DNS servers, resolvers, routers, and related software fully patched. Regular updates close known vulnerabilities that attackers exploit to compromise DNS infrastructure.
• Configure servers in a separate environment: Isolate DNS servers in a dedicated network segment with limited access paths. Segmentation restricts attacker movement if DNS is compromised and protects core systems from cascading failures.
• Enable DNS logging: Turn on detailed DNS logging and retain logs for analysis. Logs help investigate incidents, track suspicious behavior, and support faster response when security issues arise.
• Provide team training: Train staff on secure DNS management, access controls, and common attack indicators. Clear procedures reduce misconfigurations and speed up detection when something goes wrong.
• Implement rate limiting. Apply rate limiting on DNS servers or upstream providers to control query volume. This reduces the impact of DDoS and amplification attacks by preventing servers from being overwhelmed by traffic spikes.
• Backup DNS configurations. Back up DNS records and settings after every change and store copies in a secure, off-network location. Reliable backups allow quick recovery after accidental deletion, corruption, or a security breach. Test restores regularly to confirm backups work.
• Lock DNS cache. Configure resolvers to restrict cache updates to validated responses only. Cache locking reduces the risk of DNS poisoning by preventing unauthorized or spoofed records from entering the cache.
• Limit and restrict access to primary DNS servers. Restrict access to primary DNS servers to authorized users and IP addresses only. Keeping primary servers hidden from public exposure reduces the attack surface and limits opportunities for direct compromise.

Who provides DNS security?  

DNS security relies on a shared responsibility model. Global governing bodies set standards and maintain trust in the DNS system, while cybersecurity vendors and DNS providers deliver the tools and services that protect networks from real-world threats.

Internet Corporation for Assigned Names and Numbers (ICANN)  

One of the key players in maintaining global DNS security is ICANN, an organization that oversees the global DNS infrastructure and enforces policies and protocols, like DNSSEC, to ensure the internet’s stability and security. 

ICANN plays a foundational role in DNS security by: 

• Overseeing DNS root zone management to keep the global DNS infrastructure stable and secure
• Developing and promoting DNSSEC to protect against specific DNS attacks, such as cache poisoning and spoofing
• Coordinating with global partners and stakeholders to set DNS security policies and maintain trust in the internet’s naming system
• Operating the Internet Assigned Numbers Authority (IANA), which manages key internet protocol resources and root zone updates

While ICANN does not offer direct DNS security services, such as filtering or firewalls, it provides the governance and technical standards that enable DNS security providers to operate within a trusted, globally coordinated framework. 

Cybersecurity companies

Cybersecurity companies protect DNS traffic and DNS servers from active threats. These vendors develop security solutions that detect, block, and respond to DNS-based attacks in real-time.

Most cybersecurity platforms offer features such as DNS filtering, DNS firewalls, threat intelligence, and monitoring that help stop malicious domains, DNS tunneling, DNS hijacking, and DDoS attacks at the DNS layer.

Examples include:

• Palo Alto Networks: integrates DNS security into broader network protection and incident response platforms
• Infoblox: known for advanced DNS management, visibility, and protection against sophisticated threats
• Titan Secure: focuses on DNS-based threat detection and blocking for enterprise environments

These providers help security teams monitor DNS requests, analyze DNS traffic, and mitigate threats before they impact users or services.

Third-party DNS providers  

Third-party DNS providers offer managed DNS services that combine performance with built-in security controls. Many of these providers operate globally distributed, redundant DNS servers to improve availability while protecting against DNS amplification attacks and outages.

Common offerings include encrypted DNS communications, malicious domain blocking, logging, and protection against large-scale DNS attacks. Organizations often choose third-party DNS services to reduce operational overhead while improving reliability and security.

If you’re comparing standard and paid DNS services, see our guide to What is premium DNS (and why your small business needs it)? It explains which added features may be useful for your website and what to check before upgrading.

What to look for in DNS security  

When evaluating DNS security options, focus on capabilities that protect both users and infrastructure, such as:

• Encrypted DNS traffic using DoH or DoT to protect DNS requests and responses
• DNSSEC support to preserve DNS data integrity
• DNS filtering and threat intelligence to block malicious websites and domains
• Strong logging, monitoring, and alerting to support incident response
• Redundancy and access controls to reduce downtime and prevent DNS hijacking

Together, these features help organizations strengthen network security, mitigate evolving threats, and protect users from attacks that target the DNS system.

Frequently asked questions

Make DNS security part of your online strategy  

Start with what you control: secure your domain account, review your DNS records, and ask your providers which protections are available. These steps can help you spot problems early and lower the risk of someone interfering with how people reach your business.

DNS protection is one piece of a wider website security plan. If you also want to watch for problems on your website, Network Solutions cWatch offers website monitoring, malware detection and removal, and firewall features. You can compare its plans to see which features fit your site.

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