Result
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Checks
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IPv4
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Can your browser reach a server that only has an IPv4 address?
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IPv6
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Can your browser reach a server that only has an IPv6 address?
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Preferred protocol
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Which one your browser picks when a site has both. IPv6 is better when it works.
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DNS over IPv6
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Can your DNS server look up names whose name server only has an IPv6 address?
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VPN IPv6 leak
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If you use a VPN or proxy, IPv4 and IPv6 should both go through it.
Your addresses
- IPv4 address
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- IPv4 network
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- IPv6 address
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- IPv6 network
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Check for WebRTC leaksCheck for DNS leaksLook up any IP address
What this IPv6 test checks
Most sites, including this one, have both an IPv4 and an IPv6 address, so loading them doesn't tell you which one your connection can use. This test uses three test addresses of its own: one with IPv4 only, one with IPv6 only and one with both.
If the IPv6-only address loads, your connection supports IPv6. The address with both shows which protocol your browser picks; browsers prefer IPv6 and only fall back to IPv4 when IPv6 is slow or broken.
The DNS check looks up names whose name server can only be reached over IPv6. If they resolve, your DNS server can reach IPv6-only parts of the internet too.
The score adds it up: 6 points for working IPv6, 2 for the browser preferring it and 2 for DNS over IPv6.
IPv6 leaks with a VPN
Many VPNs and proxy apps only carry IPv4. When your internet provider also gives you IPv6, the IPv6 traffic skips the VPN and goes out with your real address. Sites that support IPv6 then see where you really are, even though your IPv4 address shows the VPN.
This test compares the two addresses. If IPv4 comes from a VPN, proxy or datacenter network and IPv6 comes from a different, ordinary network, IPv6 is leaking.
- Turn on the VPN app's IPv6 leak protection, or pick a VPN that supports IPv6.
- Proxy apps such as Clash or v2rayN: use TUN mode instead of the system proxy, and turn on IPv6 in TUN mode or block it.
- Or turn off IPv6 on your device or router while you use a VPN that doesn't support it.
- Run the test again afterwards. The leak check should say no leak.
How to turn on IPv6
- Router: look for an IPv6 setting under WAN or Internet and set it to automatic, DHCPv6 or SLAAC. Then restart the router.
- Internet provider: if the router setting doesn't help, ask your provider whether they offer IPv6 on your plan.
- Windows: open your network adapter's properties and make sure Internet Protocol Version 6 (TCP/IPv6) is checked.
- Phones: mobile data often has IPv6 already. On Android, the APN's protocol can be set to IPv4/IPv6.
- Settings can differ from device to device, so run the test on each device you care about.
Questions
What is IPv6?
IPv6 is the newer version of the Internet Protocol. IPv4 addresses like 203.0.113.5 have run out, so providers share them between many customers. IPv6 addresses like 2001:db8::1 are long enough that every device can get its own.
Do I need IPv6?
Not yet for most sites, since nearly everything still works over IPv4. IPv6 can be a bit faster where providers share IPv4 addresses, and some games and calls connect more easily with it. A few sites and networks are IPv6-only.
Why is my score 0/10?
Your connection doesn't have working IPv6. Either your provider doesn't offer it, your router has it turned off, or a VPN or firewall blocks it. Everything that works over IPv4 still works.
Should I turn off IPv6?
Usually not. Turn it off only if you use a VPN that doesn't carry IPv6 and this test shows an IPv6 leak, or if IPv6 on your network is broken and makes sites load slowly.
Is IPv6 safe for privacy?
Modern systems use temporary IPv6 addresses that change regularly, so sites can't follow one device for long. Like IPv4, your IPv6 address shows your provider and rough location, so a VPN should cover both.
Guides
- What is an IP address?
An IP address is the number that tells the internet where to send data meant for you. Here's what it looks like, the different kinds, and what yours says about you.
- How to find your IP address
Your public IP takes one click to find. Your private IP depends on the device. Here are the exact steps for each.
- IPv4 vs IPv6: what's the difference?
IPv6 replaces IPv4 because the world ran out of addresses. Here's how the two compare, how to tell which you're using, and why IPv6 matters if you use a VPN.
- What is a DNS leak and how do you fix it?
Even with a VPN on, your device may still ask your internet provider for every website you visit. That's a DNS leak. Here's how to spot one and stop it.