IPv6 Leak Test
Check whether your connection exposes an IPv6 address. Some VPNs tunnel only IPv4, which lets IPv6 traffic escape and reveal your real location.
How to read this result
The test asks for your address twice: once over IPv4 only, and once letting your browser choose whichever protocol it prefers. If the second answer comes back as an IPv6 address, your connection has working IPv6.
That is not a problem by itself. It becomes one when a VPN is connected and the IPv6 address shown still belongs to your own internet provider, because it means IPv6 traffic is bypassing the tunnel entirely while you believe you are protected.
Run this test with your VPN disconnected and note the addresses. Connect the VPN and run it again. Both values should change. If the IPv6 value stays the same, that traffic is leaking.
Frequently asked questions
What is an IPv6 leak?
IPv6 is the newer addressing system that is gradually replacing IPv4. Some VPNs only route IPv4 traffic through the tunnel. If your connection also has an IPv6 address, that traffic can travel outside the tunnel and reveal your real address.
Does having an IPv6 address mean I am leaking?
No. An IPv6 address only becomes a leak if your VPN does not route it. Run this test with the VPN connected: if the IPv6 address shown belongs to your provider rather than the VPN, traffic is escaping the tunnel.
How do I fix an IPv6 leak?
Use a VPN that routes or blocks IPv6 traffic, or disable IPv6 in your operating system network settings. Disabling it is a reliable fix, though it means losing IPv6 connectivity on that device.
Why do some VPNs ignore IPv6?
IPv6 support was added to many VPN products after their IPv4 routing was built, and handling both correctly requires extra work. Providers that have not done that work either leak IPv6 or block it outright.
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