Hackers identify real users behind a VPN by exploiting IP leaks, which are technical failures that allow your true IP address, DNS queries, or WebRTC traffic to escape the encrypted tunnel and become visible to anyone monitoring the connection. PureVPN blocks all three leak types by routing traffic through its own private DNS servers, enforcing IPv6 leak protection, and applying a kill switch that cuts your connection before any data escapes.
Your VPN is switched on. The padlock icon is visible. You feel covered.
But across the room, or across the world, someone is watching traffic you believe is private. They can see your real city, your real ISP, and in some cases, your actual IP address. Not because they broke your VPN’s encryption. Because they didn’t need to.
IP leaks hand hackers your identity without cracking a single cipher. According to a study by researchers at Princeton University and the University of New South Wales, over 84% of VPN users tested showed some form of detectable traffic leak, with the majority completely unaware. The VPN was running. The data was still escaping.
This is exactly what attackers exploit. And it works because most people never check.
Why Your VPN Can Be Active and Still Be Leaking Your Real IP
A VPN leak is a technical failure that causes your real IP address to become visible to outside servers, even when your VPN connection shows as active and connected.
This happens across three distinct pathways: DNS queries, WebRTC connections, and IPv6 traffic, each capable of revealing your identity completely independently of the others. Attackers who run or compromise web servers don’t need to break your VPN. They simply need to catch the traffic that never went through it.
According to ENISA (European Union Agency for Cybersecurity), IP address disclosure is one of the most actionable data points an attacker can obtain. It enables geolocation down to the city level, ISP identification, and in targeted attacks, can be matched against other leaked datasets to confirm individual identity.
The user sees a connected VPN. The attacker sees a real IP address. Both things are true at the same time.
Why Does Your Real IP Escape Even When the VPN Tunnel Is Active?
Three independent failure modes allow your real IP address to leak through an active VPN connection, and attackers specifically probe for all three.
DNS leaks occur when your device sends DNS queries outside the encrypted VPN tunnel. Your operating system is designed to resolve DNS as fast as possible. When the VPN doesn’t explicitly force DNS queries through its own private resolver, Windows, macOS, Android, and iOS all fall back to the ISP’s default DNS server. That query travels in the open, carries your real IP, and gets logged.
WebRTC leaks are a browser-level problem. WebRTC is a real-time communication API built into Chrome, Firefox, and Edge that enables video calls and peer-to-peer connections. It works by discovering your actual IP address through STUN servers, a process that bypasses VPN tunnels entirely. A webpage running background JavaScript can silently trigger a WebRTC ICE candidate request and log your true IP without any interaction from you.
IPv6 leaks happen on dual-stack networks that support both IPv4 and IPv6. Most VPNs only tunnel IPv4 traffic. If your network assigns you an IPv6 address and your VPN doesn’t block or route IPv6, that traffic flows out unprotected. Any server configured to prefer IPv6 receives your real, ISP-assigned address on every request.
As the Electronic Frontier Foundation notes,
“The very design of protocols like WebRTC means that IP discovery happens at a layer below what most VPNs protect.”
This is not a fringe edge case. It is a structural gap in how most VPN implementations interact with modern browsers and operating systems.
What Hackers Actually Do With Your Leaked IP Address
Your leaked IP address is not just a number. It is an identity anchor, and attackers know exactly how to use it.
The first thing an attacker does with a leaked IP is verify it. Tools that query MaxMind, IP-API, and ASN (Autonomous System Number) databases return your city, region, ISP name, and connection type within milliseconds. If your VPN is supposed to show a server in Amsterdam but your WebRTC leak reveals a residential IP registered to a telecom in your home country, the attacker knows the VPN is failing and where you actually are.
The second step is correlation. Hackers running malicious sites or compromised ad networks collect leaked IPs alongside browser fingerprinting signals such as screen resolution, timezone, and language settings. Your real IP, cross-referenced against a fingerprint profile, becomes a persistent identity that follows you regardless of which VPN server you connect to next.
47% of cyberattacks begin with reconnaissance, according to IBM’s X-Force Threat Intelligence Index, and a confirmed real IP address is one of the most actionable pieces of data in that phase. It tells the attacker whether you’re a home user, a corporate employee, or someone using a data center IP, and it makes every subsequent step more precise.
A VPN with a leak doesn’t reduce your attack surface. It creates a false sense of security while leaving your real IP fully visible to anyone who knows where to look.
Is Your Real IP Showing Right Now? Here’s How to Check
PureVPN’s IP leak detection tool checks your DNS, WebRTC, and IPv6 exposure simultaneously in a single test, with no technical knowledge required.
- Connect to PureVPN and select any server location.
- Open PureVPN’s IP Leak Test tool at [TOOL PAGE URL].
- Run the scan. The tool checks your visible IP address, active DNS resolvers, and WebRTC ICE candidates in real time.
- Review the results. If any address shown matches your actual ISP or geographic location instead of the VPN server, you have a confirmed leak.
- Note which leak type triggered. The results distinguish between DNS, WebRTC, and IPv6 exposures so you know exactly what is failing.
If PureVPN is working correctly, every visible address in the results should match your chosen server location, not your real ISP.
If You Find a Leak, PureVPN Closes All Three Gaps at Once
If your VPN is leaking your real IP address, switching servers or reconnecting does not fix the problem. The leak persists across sessions because it is structural, not situational.
PureVPN prevents DNS leaks by routing all DNS requests through its own private, zero-log DNS servers, so your ISP’s resolver never receives your queries and never logs your browsing history. For WebRTC, PureVPN’s network configuration blocks the local IP discovery process that browsers use to perform STUN server lookups, preventing any webpage from triggering a real-IP ICE candidate response. For IPv6, PureVPN enforces IPv6 leak protection that suppresses unprotected IPv6 traffic on dual-stack networks, ensuring all traffic exits through the encrypted tunnel.
PureVPN’s kill switch adds a final layer: if the VPN tunnel drops for any reason, the kill switch cuts your internet access before a single unencrypted packet escapes. Your real IP never has a window to appear.
Your VPN Needs to Prove It Is Working, Not Just Say It Is
A VPN with a leak is not a privacy tool. It is the appearance of one. And the gap between the appearance of privacy and actual privacy is exactly where attackers operate.
84% of VPN users tested showed detectable leaks, and most had no idea. That number doesn’t shrink on its own. It shrinks when users verify with a tool that checks all three leak types at once, against a real server connection, and shows exactly what is visible to the outside world.
The test takes 30 seconds. The exposure, if you skip it, is continuous.
Arsalan Rashid
April 1, 2026
12 hours ago
