My local network runs IPv4 and IPv6. The IPv6 is mostly experimental, as my internet service provider uses IPv4. I'm running DHCP for IPv6 on a W2K8R2 server. Several computers on my LAN have IPv6 disabled, and others have it enabled.
The IPv6 configuration which results on the computers with IPv6 enabled is peculiar. I can see the address handed out by the DHCP server, but there are other addresses which I don't recognize and don't make sense to me. There's also the linklocal address, but I know about that.
This is a snapshot of running ipconfig /all. The address from the DHCP server is circled in green (0000:0000:0000:00b0). But there's these other addresses which I don't understand. They use the same prefix as the DHCP server, but the suffix looks random (64 bits of random). This happens in Windows 7 and also Windows 11 (and presumably the versions inbetween?). The DHCP server doesn't report these extra addresses as leases.
What are these addresses, what are they for ? Where do they come from ? Is there any way I can get rid of them ?