How to Check for VPN Leaks: A Step-by-Step Testing Guide

Why You Should Test Your VPN Regularly

Even the best VPNs can occasionally leak your data. Software updates, network changes, or misconfigured settings can all create vulnerabilities. Regular testing is the only way to be sure your VPN is actually protecting you.

In this guide, we'll walk you through a quick 3-step process to test for every type of VPN leak using free online tools — including the ones right here on IP Address Details.

Step 1: Check Your IP Address

This is the most basic test. Before connecting to your VPN, visit our IP Lookup page and note your real IP address. Then connect to your VPN and refresh the page.

What to look for:

• Your IP address should change to the VPN server's IP
• Your location should show the VPN server's location, not yours
• If you see your real IP — you have an IP leak

Step 2: Test for DNS Leaks

DNS leaks are trickier because your IP might look masked while your DNS requests still go through your ISP. Head to our Privacy Leak Check tool.

What to look for:

• All DNS servers should belong to your VPN provider
• If you see your ISP's DNS servers (like your ISP's name or your city), you have a DNS leak
• Enable "DNS leak protection" in your VPN settings to fix this

Step 3: Test for WebRTC Leaks

WebRTC can bypass your VPN entirely and reveal your real IP to any website. This is especially common in Chrome and Firefox browsers.

What to look for:

• Our Privacy Leak Check shows your WebRTC status
• If your local or public IP appears in the WebRTC section, you have a leak
• Disable WebRTC in your browser settings or use a browser extension

What to Do If You Find a Leak

Quick Fixes

• Reconnect your VPN — Sometimes a simple reconnect resolves temporary leaks
• Switch VPN servers — Try a different server location
• Enable kill switch — This prevents any traffic from leaving without VPN protection
• Update your VPN app — Older versions may have known leak vulnerabilities

If Leaks Persist

If your VPN consistently leaks after trying the above fixes, it may be time to switch providers. Look for VPNs that offer:

• Built-in DNS leak protection
• WebRTC leak blocking
• IPv6 leak protection
• An automatic kill switch
• A no-logs policy verified by independent audits

Premium VPNs like NordVPN and Surfshark include all of these features and consistently pass leak tests. Visit our VPN comparison to see how top providers stack up.

Make Leak Testing a Habit

We recommend testing your VPN at least once a month, and always after:

• VPN software updates
• Operating system updates
• Switching networks (home, office, public WiFi)
• Router configuration changes

Bookmark our Privacy Leak Check tool and make it part of your regular privacy routine. Your online security depends on it.