IPv6 leak test:
does IPv6 bypass your proxy?
Many proxies and VPNs only handle IPv4. If your connection also has IPv6, websites can see that address instead. This test shows both paths and whether they match.
- IPv4 address (web requests)
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- Location of the IPv4 address
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- IPv6 address (web requests)
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- Location of the IPv6 address
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- IPv6 addresses on this device (WebRTC)
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- Our server was reached over
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How this works: your browser asks api.ipify.org and api6.ipify.org, and Cloudflare's public trace service by IPv4 and by IPv6 address, which address it is seen from over each protocol, and gathers WebRTC addresses through Google's public STUN servers. Our server also reports which protocol your request arrived over. Those services see your IP the same way any website you visit does.
What is an IPv6 leak?
Today most networks run two internet protocols side by side: IPv4 and IPv6. When a website supports both, your browser tries IPv6 first. A proxy or VPN that only knows IPv4 carries your IPv4 traffic, while IPv6 goes straight out of your own connection. The site then sees the proxy's address in one place and your real one in another.
Why it matters for you
For multi-account work, one profile that shows a mobile IP in Singapore over IPv4 and a home ISP in another country over IPv6 is easy to link and easy to flag. The leak also hits scrapers: the target may see your real range and block it.
What counts as passing
"No IPv6 detected" is a pass: nothing can leak. If IPv6 is present, it should belong to the same network as your proxy, or you should turn it off. We compare the countries of your two addresses; the same country does not prove the same network.
How to fix a leak
Turn IPv6 off for your network adapter (Windows: adapter properties; macOS: Network settings, TCP/IP, Configure IPv6 → Link-local only), or use a proxy or VPN that supports IPv6. In the router, disabling IPv6 covers every device. Then run the test again.
Questions
Is having an IPv6 address a problem?
No. IPv6 is normal and, on its own, harmless. It only becomes a problem when you rely on a proxy or VPN for privacy and that tool does not cover IPv6, because then the address bypasses it.
Why does the test say "No IPv6" when my ISP offers it?
Your router or device may not have it switched on, or a proxy, VPN, firewall or ad blocker may be blocking the IPv6 lookups. If the proxy is what blocks it, that is exactly the result you want.
The countries match. Am I safe?
Not necessarily. A home ISP and a proxy in the same country look identical to this check. The reliable test is to run it with the proxy off and on: if the IPv6 address does not change, IPv6 is not going through the proxy.
One clean mobile IP, no side doors
XProxy turns USB 4G/5G modems and Android phones into mobile proxies on real carrier IPs. Run this test with your XProxy proxy on to confirm your traffic leaves through the proxy only.
