Guides
What Is IPv6 and Do You Need It?
How IPv6 works and what an IP lookup can tell you about your connection.
IPv6 uses 128-bit addresses, compared with 32 bits for IPv4. Both protocols can operate together as dual-stack. Availability depends on your provider, router, device and the destination service.
Does IPv6 make the connection faster?
128 bits provide more address space, not more line capacity. IPv4 and IPv6 can take different routes to the same service, so performance depends on the destination and conditions. Some apps use Happy Eyeballs to stagger connection attempts over both protocols. This can reduce the initial wait, but it does not guarantee faster downloads. Falling back to IPv4 can hide a broken IPv6 path. IPv6 does not replace HTTPS or firewall rules.
What an IP lookup actually tells you
- The What Is My IP tool displays the peer address that the server sees for this request. A VPN or proxy can affect that address. The lookup does not automatically test both protocols.
- IPv6 addresses normally use hexadecimal groups separated by colons. However, a form such as ::ffff: followed by an IPv4 address can represent IPv4. Colons alone do not prove a native IPv6 Internet path.
- Follow your router model’s instructions to check IPv6 status on the Internet connection, then on the device. A local address in fe80::/10 only works on the local link; it does not confirm IPv6 Internet access.
- An IPv4 result identifies the protocol for this request. It does not prove that your connection lacks IPv6. Opening an ordinary website successfully does not establish that both address families work.
How to investigate repeatable failures
- Record the service, time, device and exact error message. Compare several services before attributing the problem to your connection.
- If a suitable app or system diagnostic identifies the address family, compare IPv4 and IPv6 to the same service on the same device under similar network load. Different test servers do not isolate the protocol’s effect.
- Check router status and distinguish failure to connect from a stall after connecting. Happy Eyeballs does not solve all problems after connection setup; a timeout alone does not identify the cause.
- Share repeatable observations privately with your provider or administrator. Remove unnecessary IP addresses and login details from screenshots or logs. Change one documented setting at a time and check the result again.
Do not disable IPv6 throughout the network because of one failure. Microsoft also advises against generally disabling IPv6 or removing its adapter binding in Windows. Keep your firewall, required VPN and management rules in place; having a reachable address does not require opening incoming connections.