An IPv6 leak happens when your VPN successfully tunnels your IPv4 traffic but leaves IPv6 traffic to travel over your normal, unprotected connection instead. The result: your real location and identity can leak out through IPv6 requests even while your VPN app shows you as fully connected. This has been a recurring, well-documented problem across the VPN industry, including a widely reported case earlier in 2026 where a popular provider kept leaking IPv6 addresses even after an initial patch. Here’s how to check for it and fix it properly.
Why IPv6 leaks happen in the first place
IPv6 is the newer internet addressing protocol, gradually replacing IPv4, and it’s enabled by default on most modern operating systems and routers. Many VPN apps, particularly older ones or those built primarily around IPv4 tunneling, either don’t route IPv6 traffic through the encrypted tunnel at all, or handle it inconsistently across different apps and operating system versions.
When that happens, any website, app, or service that supports IPv6, and a growing share of the internet does, can potentially see your real IPv6 address even while your IPv4 traffic is correctly routed through the VPN. Your VPN app’s status shows “Connected,” but a meaningful portion of your traffic isn’t actually protected.
Step 1: Check whether you have an IPv6 leak right now
Connect to your VPN as you normally would. Then visit an IP address checking site that specifically tests for both IPv4 and IPv6 addresses (several dedicated leak-testing sites exist for exactly this purpose). If the site shows your VPN server’s IP address for the IPv4 result but displays your real internet provider’s IPv6 address separately, you have a leak.
If the site shows no IPv6 address at all, or shows an address that matches your VPN provider rather than your home ISP, you’re not currently affected.
Step 2: Update your VPN app to the latest version
This sounds obvious, but it’s the single most common fix. Most reputable VPN providers have significantly improved IPv6 handling over the past couple of years specifically in response to leak reports, and running an outdated app version is one of the most frequent causes of a leak that a newer release has already fixed. Check your app store or the provider’s website for the latest version before troubleshooting further.
Step 3: Enable IPv6 leak protection if your VPN offers it
Many VPN apps now include a specific setting, sometimes labeled “IPv6 leak protection” or bundled into general leak protection settings, that either tunnels IPv6 traffic properly or blocks it outright when it can’t be tunneled. Check your app’s settings menu, usually under “Connection” or “Advanced,” and make sure this is switched on.
Step 4: Disable IPv6 at the operating system level as a fallback
If your VPN app doesn’t tunnel IPv6 traffic at all, and provides no way to block it either, disabling IPv6 system-wide is a reliable manual fix. On Windows, this is done through your network adapter’s properties in Control Panel, unchecking the IPv6 protocol box. On macOS, it requires Terminal commands, since there’s no simple toggle in System Settings. On Android, IPv6 can typically be restricted through developer options or, more reliably, controlled at the router level.
This is a blunt fix: it stops the leak by removing IPv6 connectivity entirely rather than properly tunneling it, so a small number of IPv6-only services may become unreachable. For most users this trade-off is fine, since IPv4 still covers the vast majority of the internet.
Step 5: Test again to confirm the fix worked
Repeat Step 1 after making any change. Reconnect your VPN and recheck an IP leak testing site. A properly fixed setup will show either no IPv6 address at all, or one that matches your VPN provider rather than your home connection.
Want to compare all VPNs side by side? Check our full VPN comparison table with scores across 18 criteria.
Which VPNs handle IPv6 properly by default
NordVPN and ProtonVPN both include built-in IPv6 leak protection as a default part of their leak protection suite, scoring 5/5 in our leak protection testing across IP, DNS, and WebRTC categories. Neither requires manual OS-level intervention in typical use.
Providers with a documented history of IPv6 leak issues are worth extra scrutiny before you trust them for anything privacy-sensitive. If a provider needed an emergency patch for a persistent IPv6 leak, as happened publicly with one popular free VPN app in 2026, that’s a signal worth weighing when you’re choosing which service to rely on.
Why this matters more than it might seem
An IPv6 leak defeats the core reason most people use a VPN in the first place: hiding your real IP address and location. If you’re using a VPN specifically to access region-locked content, protect your identity while researching something sensitive, or simply keep your ISP from tracking your activity, a silent IPv6 leak can undermine all of that while your VPN app shows a reassuring “Connected” status the entire time. Checking for this once, and after any major VPN app update, is a small habit that closes a real and surprisingly common gap.
Router-level VPN setups and IPv6 leaks
If you run your VPN at the router level rather than through individual device apps, the same leak risk applies, and arguably matters more, since every device on the network inherits whatever leak the router configuration has. Most consumer routers with native VPN client support (or those running custom firmware like OpenWrt or DD-WRT with a VPN configured) handle this by disabling IPv6 forwarding entirely at the router, which sidesteps the leak issue the same way the OS-level fallback described above does, just applied network-wide instead of per device. When setting up a router-based VPN, checking your provider’s specific router configuration guide for IPv6 handling instructions is worth doing during initial setup rather than discovering the gap later through a leak test.
Why some VPNs still handle this inconsistently
IPv6 adoption has grown steadily but unevenly across networks, ISPs, and countries, which means some VPN providers historically deprioritized IPv6 handling since it affected a smaller share of their user base at the time. As IPv6 traffic has become more common, providers who didn’t build tunneling for it from the start have had to retrofit the handling in, which is part of why leak reports still surface periodically even at established providers, rather than being purely a problem confined to smaller or newer services. This is also why checking a provider’s specific, current leak protection scores, rather than assuming any paid VPN handles this correctly by default, remains a reasonable step before trusting a provider with anything privacy-sensitive.
A related check worth doing at the same time
While you’re testing for leaks, it’s worth also checking for DNS leaks, a related but separate issue where your DNS queries bypass the VPN tunnel even if your IP address itself is properly hidden. The same leak-testing sites that check IPv6 typically check DNS leaks simultaneously, so it’s an easy addition to the same five-minute check.
An IPv6 leak can quietly expose your real IP address even while your VPN shows as connected. Update your app, enable IPv6 leak protection if it's offered, and fall back to disabling IPv6 at the OS level if your provider doesn't handle it properly. NordVPN and ProtonVPN both include reliable IPv6 leak protection by default, which is worth prioritizing if this is a recurring concern for you.
Keep reading: How to Check if Your VPN Is Leaking Your IP Address and Turbo VPN’s Emergency Patch for a Persistent IPv6 Leak.