Guide
IPv6 in 2026
Over half of the world's internet traffic now reaches sites over IPv6 — led by mobile networks. Where adoption stands, why the shift is effectively irreversible, and how to check your own line.
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Where adoption stands
As of 2025–26, roughly half of the world's internet traffic is delivered over IPv6 — by most measurements somewhere between 45% and 55% globally, with the majority share growing every quarter. The United States crossed 50% for traffic to major platforms, France leads the major markets at around 80%, India is above 70%, while China remains an outlier in the low teens. Mobile networks are the engine: 4G/5G cores were built IPv6-first, so a phone is often more likely to be dual-stack than a home line.
The practical consequence: an "IPv6 address" in your checker is no longer a curiosity. For a meaningful share of the world's connections it is the primary address, with IPv4 as the fallback.
Why the shift happened
- IPv4 ran out — the regional registries exhausted their free pools between 2011 and 2019; unique v4 blocks now trade on a secondary market, with a /24 (256 addresses) costing hundreds of dollars. Sharing via NAT/CGNAT worked, but at a cost in functionality and complexity (what is CGNAT).
- Mobile and IoT — billions of phones and devices cannot all get unique v4s; v6's address space is not just sufficient, it is silly (340 undecillion addresses).
- Cloud defaults — new instances at the major clouds get IPv6 by default; the whole server-side of the internet is already dual-stack.
- Cost of staying v4-only — translation and NAT64 add boxes to maintain; for new infrastructure, v6 is simply the cheaper path.
What dual-stack means for you
A dual-stack connection has both addresses. When you visit a site, your client picks the better path — usually v6 when both are offered. What that means in practice:
- the checker's IPv6 row is a real, live address, not a bonus; sites you visit may be reachable only by v6 by now;
- your v6 device-part rotates with privacy extensions while the network prefix stays stable;
- VPN users: a tunnel that only carries IPv4 lets your real v6 walk out in the clear — the single most common "leak" in 2026, which is why the five-point test in is my VPN working checks both rows;
- privacy and security details in IPv4 vs IPv6.
How v4-only sites stay reachable
The internet does not run on one version. Translation technology keeps the two halves connected: NAT64/DNS64 lets a v6-only client reach a v4-only server by synthesising a gateway address and translating the traffic, and carrier-grade translation does the reverse for legacy v4 islands. That is why a fully IPv6 phone still loads every old website — the edges are being translated, invisibly, all the time.
Check your own line
- Open the checker — the IPv6 row shows a live v6 address when your line is dual-stack.
- Nothing there? Ask the ISP whether v6 is enabled on your plan, and check the router's WAN/IPv6 settings — it is a common switch-off.
- On mobile, toggle airplane mode and re-check; carrier v6 is often on even when home v6 is not.
Bottom line: dual-stack is the default world now, and the direction of travel is not in doubt. Knowing which of your two addresses a website actually saw — and whether the v6 one is leaking around your tools — is now everyday IP hygiene, not expert territory.
Frequently asked questions
Will IPv4 be switched off?
Not in any foreseeable horizon. Dual-stack plus translation keeps v4 reachable for the long tail of legacy infrastructure; v4 becomes the compatibility layer, like email attachment support, rather than disappearing.
Is IPv6 safer or less safe than IPv4?
Mixed. Without universal NAT, every device is globally addressable — but modern OS firewalls default to denying unsolicited inbound traffic, so the practical exposure is small. Privacy extensions add per-visit untrackability at the address level that v4-with-NAT never had.
Why is my country's adoption rate low?
Adoption follows ISP strategy and legacy infrastructure more than demand. Regions with huge v4 back-logs (certain national carriers) convert slowly; regions that ran out early convert fast.
Keep reading
- What is an IP address?
- Public vs private IP addresses
- IPv4 vs IPv6
- How to hide your IP address
- How to check your IP address on a phone
- What is CGNAT?
- How to change your IP address
- Why does my IP address keep changing?
- How to find a website's IP address
- What is a datacenter IP?
- IPv6 privacy extensions
- What is an ASN?
- How IP geolocation works
- What is a local IP address?
- Why am I getting blocked or stuck on CAPTCHAs?
- What is IP reputation?
- How websites detect VPNs and proxies
- What is a DNS leak?
- What is a WebRTC leak?
- Proxy vs VPN
- How to check if your VPN actually works
- Static vs dynamic public IP
- How to find out who owns an IP address
- Check my public IP address
Check any other IP address
Investigating a suspicious login, a spam email header or a server log entry? Run any IPv4 or IPv6 address through the same geolocation and proxy checks.