Why DNS Leaks Are More Dangerous Than You Think
What Is a DNS Leak?
When you visit a website, your device first asks a DNS resolver to translate the domain name into an IP address. Under normal circumstances, a VPN or proxy routes that query through an encrypted tunnel — so your ISP and any observers only see encrypted traffic. A DNS leak occurs when those queries bypass the tunnel and reach your ISP's resolver directly. Even if your real IP is hidden, the list of domains you queried is completely exposed.
Why This Matters
DNS queries are a detailed diary of your browsing habits. Every domain lookup reveals which services you use, when you use them, and roughly how often. Advertisers, ISPs, and surveillance agencies can build a precise profile from nothing but DNS logs — no packet inspection required. The danger is that most VPN clients show a green "connected" indicator even when leaks are occurring, creating a false sense of security.
How to Detect a Leak
The fastest way is to visit a DNS leak test site while connected to your VPN or proxy. The test resolves a series of unique subdomains and checks which resolver answered. If you see your ISP's name or your home IP region in the results, you have a leak. You can also run the test from the command line using `dig` or `nslookup` against a known test domain.
Fixing the Problem
On most operating systems you can force DNS queries through a specific resolver by setting your network adapter's DNS servers to one that respects privacy (such as 1.1.1.1 or 9.9.9.9). Many VPN clients expose a "DNS leak protection" or "kill switch" setting — enable it. If you use a web proxy like Proxy24, DNS is resolved server-side, so your local resolver is never consulted and leaks are structurally impossible.