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Sicherheitsberatung

DNS is a weak point that may track everything you do

Many people are unknowingly sharing their data. In this post, I’ll show you how to check if you’re one of them and how to fix it quickly.

Your browser needs to find the right website every time you type an address. That’s the role of DNS servers.


The issue?
👉 By default, you use your internet provider’s DNS.
👉 These DNS servers keep records of your searches, habits, and activities.

Even if you use a VPN or clear your history, the information is still stored. It can be sold or used against you.

A poorly set up VPN can lead to DNS leaks.

What’s the problem?
👉 Your DNS requests go outside the secure tunnel.
👉 Your ISP can monitor the websites you visit.
👉 Your “anonymity” is lost quickly.
📌 Many believe VPN = safety.

But if your DNS isn’t secure, you are at risk.

You think your VPN keeps you safe

But you’re using 1.1.1.1, 8.8.8.8, or your ISP’s DNS. That means even if your traffic is encrypted, the sites you visit might still leak outside the tunnel.

📉 This isn’t just a small mistake:
It’s one of the most common privacy failures. And it can cost you.

Your Internet provider knows you’re using a VPN, even if they can’t see your browsing activity.

However, if your VPN doesn’t use its own DNS, or if your system isn’t set up correctly, your DNS queries can leak. What does this mean?

✅ You think you’re secured.
❌ But your website requests might be handled by Google or your internet provider.

👉 Many people think a VPN hides everything.

But DNS leaks can happen. Make sure your VPN has its own secure DNS, or you could be revealing more than you realize. Try using tools like:

www.controld.com/tools/dns-leak-test

They can check if your DNS requests are leaking outside your VPN.

Popular VPNs like Mullvad and iVPN offer built-in protection against DNS, IPv6, and WebRTC leaks, but this only works if they are updated and set up correctly.

⚠️ Caution: Some apps use fixed DNS servers, which can ignore your VPN settings and expose your data. This is known as “DNS hardcoding.”

To stay protected, use privacy-focused public DNS like Quad9 (blocks malware) or AdGuard DNS (blocks ads, trackers, and harmful sites; supports secure DNS methods: DoH, DoT, DNSCrypt).

📱 On Android, apps like RethinkDNS and NetGuard allow you to control how apps resolve domain names, keeping you safe even if an app tries to bypass your VPN.

Your metadata, like when and how you connect, can still be seen by others even with safe VPNs and DNS. This can tell a lot about you.

Organisations like the 14 Eyes use this information for broad surveillance. That’s why using tools like Tor or multi-hop VPNs is important to make it harder to track you.

Want to really protect your privacy? Just encrypting isn’t enough; you also need to hide your metadata.

Read also: Organisationen wie die 14 Eyes sammeln und geben Ihre Metadaten zur Massenüberwachung weiter

Now that you understand the importance of protecting your data, here are some simple tools and habits I use to reduce risks:

1️⃣ Use private browsers like Brave.
2️⃣ Choose VPNs that provide multi-hop.
3️⃣ Set up secure DNS.

4️⃣ Avoid using unprotected public WiFi.
5️⃣ Check app permissions for accessing your data.

Privacy is an ongoing journey, not a final goal.

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