---
title: "IPv6 Leak: The Silent VPN Privacy Risk"
url: "https://astraguardvpn.com/blog/ipv6-leak-silent-vpn-privacy-risk"
description: "IPv6 leak explained: how dual-stack networks expose VPN users and how to prevent IPv6 leaks."
updated: "2026-07-15T00:42:22.503Z"
---

# IPv6 Leak: The Silent VPN Privacy Risk

Many VPNs tunnel IPv4 only. Your device may still use IPv6 and reveal your real network path.

Many VPNs tunnel IPv4 only. Your device may still use IPv6 and reveal your real network path. What is an IPv6 leak? An IPv6 leak occurs when your device prefers or falls back to IPv6 while the VPN only encapsulates IPv4. Sites and trackers can see your native IPv6 address even though your IPv4 appears as the VPN. Why IPv6 leaks are increasing ISPs and mobile carriers roll out dual-stack by default. Home routers advertise IPv6 via RA/DHCPv6. Browsers happily use AAAA records. If the VPN client does not route or block IPv6, privacy fails quietly. How to detect an IPv6 leak Connect the VPN, then visit an IP check that reports both IPv4 and IPv6. If IPv6 shows your ISP prefix while IPv4 shows the VPN, you have a leak. Also check WebRTC STUN results for IPv6 candidates. How to prevent IPv6 leaks Use a VPN that supports full IPv6 tunneling or blocks IPv6 outside the tunnel Temporarily disable IPv6 on the active interface for testing Avoid split routes that leave IPv6 default routes intact Retest after OS upgrades — they often re-enable IPv6 AstraGuard approach Pair VPN connection with leak tests on our privacy tools . If you see IPv6 exposure, disable IPv6 on that network or switch protocols/servers and retest until only the VPN path remains. IPv6 leak FAQ Why does my IPv4 show VPN but IPv6 shows ISP? The VPN client routed IPv4 only. Your OS still has a global IPv6 address and happy eyeballs prefers it for some destinations. Should I disable IPv6 forever? Only as a containment measure when your VPN lacks IPv6 support. Prefer a provider path that tunnels or blocks IPv6 deliberately. Protect yourself with AstraGuard VPN AstraGuard VPN helps keep DNS inside the tunnel with strong encryption, kill switch options, and simple setup on desktop and mobile. Create an account , pick a plan on packages , then verify on privacy tools .

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