DNS Security Blog
Practical guides and threat insights on DNS filtering, privacy and network protection.
DNS Firewall vs Network Firewall: What Is the Difference?
A DNS firewall blocks dangerous domains before a connection starts; a network firewall controls traffic by IP, port and protocol. Here is how they differ.
What Is Protective DNS? A Practical Explanation
Protective DNS is a resolver that refuses to answer for malicious domains. Learn how it works, why governments recommend it and how to deploy it at work.
DoH vs DoT vs DoQ: Encrypted DNS Protocols Compared
DNS-over-HTTPS, DNS-over-TLS and DNS-over-QUIC all encrypt lookups. Compare how they work, their ports, support and what each means for DNS filtering.
How to Check Which DNS Server You Are Using
Find out which DNS server your computer, phone or router really uses. Step-by-step checks for Windows, macOS, Linux, iPhone, Android and your browser.
How to Block Adult Content with DNS Filtering
Block adult websites on every device at home or school with DNS filtering. How category blocking works, how to set it up and how to prevent workarounds.
How to Block Gambling Sites with DNS Filtering
Block online casinos, betting and gambling sites on every device with DNS filtering. Setup steps, how to stop workarounds and where to find extra support.
Why DNS Blocking Cannot Stop YouTube Ads
DNS ad blocking removes many ads, but not on YouTube. Learn why video ads are served from the same domains as videos, and what does and does not help.
DNS Sinkhole Explained: How It Works and When to Use It
A DNS sinkhole answers lookups for bad domains with a harmless address. Learn how sinkholes work, how they stop malware and how they differ from NXDOMAIN.
How to Stop Devices Bypassing DNS Filtering
Devices can bypass DNS filtering with custom DNS, encrypted DNS, VPNs and IPv6. Learn each bypass method and the firewall and policy settings that stop it.
What Is a DNS Firewall? A Plain-English Guide
A DNS firewall blocks dangerous domains before any connection is made. Learn how it works, what it stops and how it differs from a classic firewall.
Why Blocking Newly Registered Domains Stops Phishing
Most phishing sites live only hours or days. Blocking young domains using registration data cuts off scams before threat lists catch up.
DNS over HTTPS and DNS over TLS Explained
Classic DNS is sent in plain text. Learn how DoH and DoT encrypt lookups, protect privacy and how they work together with filtering.
Parental Controls with DNS: A Practical Setup
Use DNS to block adult content, enforce SafeSearch, limit apps like TikTok and set schedules for every device at home, with nothing to install.
DNS Rebinding: How Websites Attack Your Router
DNS rebinding lets a malicious page reach devices on your local network. See how it works and how a DNS firewall blocks it.
How to Set Up a DNS Firewall on Your Router
Step-by-step instructions to point your home or office router at a DNS firewall and protect every connected device.
DNS Firewall for Small Business: Affordable Protection That Works
Small businesses are prime phishing targets. See how a DNS firewall protects every office device without IT staff or expensive hardware.
How to Block Ads and Tracking on Smart TVs
Smart TVs collect viewing data and show ads you cannot remove with an app. Learn how DNS blocking stops TV tracking network-wide.
How Malware Uses DNS and How to Stop It
Malware relies on DNS to find its command servers, exfiltrate data and download payloads. Learn the techniques and the DNS-level defenses.
Protecting IoT and Smart Home Devices with DNS
Cameras, plugs and speakers rarely get security updates. Use DNS filtering to limit what IoT devices can reach and spot compromised ones.
DNS Filtering for Schools and Libraries
Keep students safe online with DNS filtering: block harmful content, enforce SafeSearch and cover every device on the network.
What Is DNS? How the Internet Phone Book Works
DNS turns names like example.com into IP addresses. A beginner-friendly explanation of resolvers, records, caching and why DNS matters for security.
Typosquatting and Look-Alike Domains Explained
Attackers register domains that look like real brands to steal logins. Learn how typosquatting works and how DNS filtering blocks it.
Stop Your ISP from Tracking Your DNS Queries
By default your ISP sees every domain you visit through DNS. Learn how encrypted DNS and a privacy-focused resolver keep your browsing private.