IPv6 not detected: common causes and fixes
When IPv6 is not detected, the missing piece can be anywhere in the chain: the ISP, modem, router, OS, VPN, browser, or the way a specific host is being reached.
- Why IPv6 disappears on some networks.
- How to test whether the problem is local or upstream.
- What to compare on WhenIP for fast isolation.
Common causes
Your ISP may not deliver native IPv6 on that circuit.
Your router may not have IPv6 enabled or may not be receiving a prefix.
A VPN or privacy relay may be disabling IPv6 intentionally.
Quick checks
Compare whenip.com, ipv4.whenip.com, and ipv6.whenip.com.
Turn the VPN off temporarily and reload the pages.
Check router status for prefix delegation or WAN IPv6 state.
What not to assume
A missing IPv6 result does not automatically mean the browser is broken.
It also does not prove your whole network is down; IPv4 may still be working normally.
When to escalate
If multiple devices on the same network never show IPv6, check the router and ISP first.
If only one app or one browser differs, compare browser privacy and extension settings.
Can a VPN hide IPv6 on purpose?
Yes. Many VPNs do this to avoid leaks.
Can I have working IPv4 and broken IPv6 at the same time?
Yes. That is very common during rollout or misconfiguration.
Last updated: March 29, 2026