Is Your Network Really IPv6-Ready? Check in 10 Seconds

IPv4 addresses ran out years ago. Most of us are now behind carrier-grade NAT (CGNAT) without even knowing it — which quietly breaks self-hosting, P2P connections, game servers, and direct remote access to your NAS.

So here's a simple question: does your network actually support IPv6 right now?

What the test checks

I built a free tool that answers this instantly: https://17nas.com/ipv6-test.php?lang=en-US

Open it and you immediately get:

• Your IPv4 and IPv6 addresses (if you have one — many people discover they don't)
• Dual-stack status — whether your connection can use both protocols
• Latency to the test endpoints
• ISP / network info attached to your addresses

No sign-up, no install. It runs entirely in the browser.

Why developers should care

• Self-hosting: no IPv6 and no public IPv4 means you're stuck with relay tunnels or port-forwarding hacks.
• WebRTC / P2P: works dramatically better with real end-to-end connectivity.
• Debugging user reports: "it works on my machine" is often a v4/v6 difference between networks.

How it works

The page fetches a tiny asset over IPv4 and IPv6 in parallel from dual-stack endpoints. Whichever succeeds tells you what your network can actually reach — not what your ISP's marketing page claims.

If the test shows no IPv6 address, it's worth asking your ISP when they plan to enable it. And if you're on CGNAT with no public IPv4 either, that's useful to know before you spend a weekend trying to expose a home server.

Disclosure: I built this free tool. It's part of 17NAS, a small collection of free network utilities (the same site also has a NAT type test and a browser/IP timezone checker).