Facedesk.
You could just ipconfig /all and compare the fe80 addresses or 'netsh int ipv6 show neigh' to see the IPv6->MAC association.
The IPv4 link-local equivalent would be something like the APIPA 169.254/16 range, both of which aren't routable on the internet, so by definition it is just traffic on your local LAN itself. You probably don't even have an IPv6 WAN address from your provider, either.
Also, you really aren't going to 'catch' anything checking netstat unless you were already screwed, especially if you don't have a particular breadth of networking knowledge.