well when you say 192 IPs that makes sense to me because those are router IP addresses, but when you connect to a website or to someone on limewire your ip doesn't show up at 192, your ip shows up as the IP assigned to your connection. 192's are just there for internal networking, when you connect to an outside network (ie a website) they see your connections IP. Go to www.whatismyip.com to see your "real" ip address. You'll notice its quite different from the one windows displays when you go to your network connections.

But even if your IP is constantly changing....doesn't your ISP record alll those?