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IPv6 Leak Test

Check whether your VPN still exposes native IPv6 routing and learn how to fix common leak patterns

Why leaks matter

Some VPN setups only tunnel IPv4 traffic. If your normal network also provides IPv6, websites can still see an IPv6 route that belongs to your home ISP or mobile carrier. Seeing IPv6 on its own is not always a leak. The real question is whether that IPv6 route still belongs to your original network after the VPN connects.

How to run an IPv6 leak test

  1. Start on the homepage IP checker and note the visible IP version, ISP, and ASN before connecting your VPN.
  2. Connect your VPN and reload the same page. If your connection still shows with the same residential/mobile provider context, that is a warning sign.
  3. Use IP Location and ASN Lookup to compare provider and routing ownership before and after the VPN.
  4. Run DNS Leak Test and WebRTC Leak Test as companion checks. IPv6 leaks often appear together with other routing mistakes.

Important nuance: if your VPN provider supports native IPv6 well, seeing an IPv6 result is not automatically a failure. The failure is when the IPv6 result still maps back to your normal ISP or your expected non-VPN route.

Core checks

Common IPv6 leak signs

  • IPv4 changes after VPN connect, but IPv6 still maps to your original ISP.
  • Location and ASN stay tied to your home or mobile network on IPv6.
  • Sites still identify your original region even when VPN IPv4 changed.
  • DNS or WebRTC tests still show clues that match your normal network path.

This is why a simple IP change check is not enough. You want the visible route, DNS behavior, and browser behavior to tell a consistent story after the VPN connects.

Related explainers

How to fix IPv6 leaks

  • Prefer VPNs with full IPv6 support or explicit IPv6 leak protection.
  • Enable kill switch and leak protection features in the VPN app.
  • Review split tunneling rules and browser-specific proxy settings.
  • If your provider does not handle IPv6 properly, disable IPv6 on the device or router as a fallback, then retest.
  • Repeat the same checks after browser, OS, or VPN app updates.

If you need a broader privacy check after fixing IPv6 behavior, continue into the full VPN verification checklist.

Fix and compare

What to do next after an IPv6 leak check

IPv6 is only one leak path. Validate DNS, WebRTC, and full VPN routing before trusting the setup.

1Next step
Resolver path

Run a DNS leak test

DNS leaks can still expose ISP or resolver information even after IPv6 behavior looks fixed.

Check DNS leaks
2Next step
Browser leak

Run a WebRTC leak test

Browser-level STUN/WebRTC behavior can expose extra network details outside the VPN route.

Check WebRTC leaks
3Next step
Guided flow

Use the VPN verification wizard

Track IP, DNS, WebRTC, proxy signals, and optional ASN changes in one guided workflow.

Open wizard
4Next step
Fix

Compare VPN providers

If your current provider cannot handle IPv6 safely, compare stronger VPN options and then retest.

Compare VPNs

Protect your IP

Related Articles

VPN Connected but IP Not Changing? How to Fix It8 min read • February 9, 2026VPN vs Proxy: Privacy, Speed, and Which to Use14 min read • December 1, 2025What is a VPN and How Does it Work?9 min read • November 9, 2025IPv4 vs IPv6: Understanding the Differences10 min read • November 4, 2025

Frequently asked questions

What is an IPv6 leak?
An IPv6 leak happens when your VPN fails to tunnel or safely suppress your native IPv6 route, so websites can still see IPv6 information tied to your normal network.
If I still see IPv6 after connecting a VPN, is that always a leak?
No. Some VPNs support native IPv6 correctly. The issue is whether the visible IPv6 route still belongs to your original ISP or network context.
How do I fix an IPv6 leak?
Use a VPN with IPv6 support or leak protection, review split tunneling and browser settings, and disable IPv6 on the device or router if needed as a fallback.
Should I run DNS and WebRTC tests too?
Yes. IPv6 leaks often appear alongside DNS or WebRTC exposure, so you should verify all three paths when testing a VPN.
Do all home networks even use IPv6?
No. Some ISPs and networks still rely mostly on IPv4, while others use dual-stack or IPv6 heavily. That is why baseline checking matters before you call it a leak.