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IPv6 address visible while VPN is connected: is it a leak?
Seeing IPv6 alone does not prove there is a leak. The address may be VPN-owned and tunneled, it may be the ISP address that remains available on a separate route, or the VPN may intentionally block IPv6. Run the IPv6 test after saving a connection baseline.
Simple decision path
- Did the public IP change after the VPN connected?
- Is the visible IPv6 recognisably the ISP/network baseline, or does it match the VPN’s documented design?
- Does the provider say IPv6 is tunneled, blocked, or limited on this operating system?
- Does the result reproduce after reconnecting and in another browser?
Three interpretations
| Result | Next step |
|---|---|
| No IPv6 shown | Confirm whether the network is IPv4-only or IPv6 is intentionally blocked. |
| Different IPv6 that fits the VPN design | Verify with provider documentation; it may be tunneled. |
| Baseline ISP IPv6 remains visible | Treat it as a possible separate path and troubleshoot settings. |
Platform differences matter
Windows, mobile systems, router connections, and browser profiles can prioritize addresses differently. A provider can support IPv6 on one app but block it on another. That is why a generic ranking cannot replace a check on your actual device.
What to do next
Reconnect once, review the provider’s IPv6 and kill-switch settings, and remove split tunnelling from the browser while diagnosing. If IPv4 itself is unchanged, use VPN connected but real IP is showing. For a provider comparison, read best VPN for IPv6 leak protection.
Bottom line
Look for an unintended ISP path, not merely an IPv6 field. A visible address needs ownership and routing context before it earns the word “leak.”
Try the matching check
These pages run in this browser. They report what they observe. They cannot prove that a VPN is on, that DNS is protected, or that you are anonymous.
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