IPExposed
Privacy Guide

Best VPNs That Protect Both IPv4 and IPv6

5 min read · Updated April 2026

Short answer: most commercial Virtual Private Networks (VPNs) tunnel only Internet Protocol version 4 (IPv4) traffic. That leaves Internet Protocol version 6 (IPv6) traffic going directly to its destination, bypassing the VPN tunnel entirely — exposing your real IPv6 address to every site you visit.

Here is what a proper dual-stack VPN looks like, and what questions to ask before you choose one.

The IPv6 Leak Problem, Recapped

Modern Internet connections are dual-stack: your Internet Service Provider (ISP) assigns you both an IPv4 address and an IPv6 address. IPv6 was defined in RFC 8200 and has been increasingly deployed over the past decade. As of 2024, IPv6 carries a significant and growing share of global internet traffic.

When you connect to a VPN that only handles IPv4, your device continues sending IPv6 traffic directly — without the tunnel. Any website that supports IPv6 (and most major sites do) will see your real IPv6 address from your ISP, not the VPN server's address. Your location and ISP remain fully visible for IPv6 connections, even while you believe the VPN is protecting you.

Cloudflare's learning center has a clear technical explanation of how IPv6 leaks happen and why they are a meaningful privacy gap.

Check whether your connection is dual-stack — we show your IPv4 and IPv6 addresses if both are active. If you see an IPv6 address while connected to a VPN, your VPN is not tunneling it.

What to Look For in a Dual-Stack VPN

Not all claims of "IPv6 support" are equal. When evaluating a provider, look for these specific properties:

Native IPv6 tunneling — not just disabling. Some providers respond to IPv6 leaks by simply disabling IPv6 on your device when the VPN is active. This prevents leaks but is not the same as tunneling IPv6 traffic. If the provider cannot tell you which method they use, assume it is the disable-only approach. Native tunneling routes your IPv6 traffic through the VPN server — you get an IPv6 address associated with the server location, not your ISP.

A kill switch that covers all traffic. A VPN kill switch cuts your internet connection if the VPN tunnel drops unexpectedly. The critical detail is whether the kill switch covers IPv6 traffic as well as IPv4. A kill switch that only blocks IPv4 during a reconnect is not complete protection.

Published, dated independent audits. Privacy claims are easy to make. An audit by a named third-party security firm — with a published report and a recent date — gives you evidence that the implementation has been tested. Look for audit reports that specifically address IPv6 handling and DNS leak testing.

Transparent documentation. A provider that publicly documents how they handle IPv6 is making a verifiable claim. A provider that does not mention IPv6 at all on their site almost certainly does not tunnel it.

Providers That Publicly Support IPv6

The VPN market has dozens of providers, but far fewer publish explicit documentation about full IPv6 support. Providers that publicly document their approach to dual-stack handling give you the ability to hold them to that documentation — which is a meaningful accountability mechanism.

The two providers this site links to through the affiliate CTA below are among those that publish IPv6-related documentation. We do not make quantitative comparisons between providers or fabricate rankings — the landscape shifts, and claims that are accurate today may not be accurate after an update to a provider's infrastructure.

If you want to independently verify IPv6 handling, connect to a VPN and then visit this site or a dedicated leak testing tool. If your IPv6 address is visible, the VPN is not tunneling it.

What to Avoid

"IPv6 disabled" as the only solution. Some providers explicitly state they disable IPv6 rather than tunnel it. This prevents leaks but breaks IPv6-only resources, which can cause connection failures on some ISPs (particularly Comcast/Xfinity networks that rely heavily on IPv6 for home subscribers). Ask whether the provider tunnels IPv6 natively or disables it.

No IPv6 documentation at all. If a provider's website does not mention IPv6, assume they do not handle it. The absence of documentation is itself a signal. A provider that has invested in proper dual-stack support will document it because it is a competitive advantage.

Only "leak protection" mentioned, not "tunneling." "IPv6 leak protection" sometimes means "we disable IPv6." "IPv6 tunneling" means they route the traffic. These are different things with different implications for your connection quality and privacy.

So What Does This Mean for You?

If you are using a VPN for privacy, an IPv6 leak defeats much of the reason to use one. Your real ISP, your real location, and your real identity linkage through your ISP's IPv6 assignment are all exposed to every dual-stack site you visit — which includes most major services.

Choosing a VPN specifically for privacy means asking about IPv6 handling explicitly. Native tunneling, a comprehensive kill switch, and dated audit reports are the three properties that distinguish providers with serious infrastructure from those reselling privacy theater.

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