Leak Tests
IPv6 Leak Test
Check if your VPN is leaking your IPv6 address. Many VPNs protect IPv4 but leave IPv6 completely exposed — revealing your real ISP and location to every website you visit.
Your IPv4 address
VPN routing
Click Run Leak Test…
Waiting for test
Your IPv6 address
Checking…
Click Run Leak Test…
Waiting for test
Run the test to check for IPv6 leaks
Click the button above to test your IPv4 and IPv6 addresses simultaneously.
Scored using our published, open-source methodology. View methodology
How an IPv6 leak happens
The 3-step leak mechanism — why your VPN can fail on IPv6
You connect your VPN
Your VPN tunnels all IPv4 traffic through its server — your IPv4 address becomes the VPN's IP, exactly as expected.
VPN ignores IPv6
Most VPNs only tunnel IPv4. Your device still has a live IPv6 address assigned by your ISP — and the VPN doesn't touch it at all.
Websites see your real IP
Any site that supports IPv6 receives your real ISP IPv6 address — bypassing the VPN entirely and exposing your real location.
Who is most at risk from IPv6 leaks
How to fix an IPv6 leak
IPv4 vs IPv6 — key differences relevant to VPN users
IPv4
IPv6