[talent_deprived]

The IPv4 at my router yes. That's where tracking ends. IPv6 privacy is an illusion, try the test I described, remove IPv6 from your router at home, wait a few hours or few days, the family will complain search results are odd or messed up and that's only the beginning of it.

I don't know how companies are doing it but they are able to track your IPv6 changed daily or not.

[icedchai]

They probably just track the IPv6 /64. With prefix delegation, the /64 would rarely change, unless your provider delegated a new block. This is similar to your IPv4 router changing its address w/DHCP: it happens, but is relatively rare.

[Thiez]

Also just cookies and browser fingerprinting.