title: VPC Network - IP not in use, but actually ping
body: <p>So I've got one dilemma with external IP</p>
  <p>On the External IP addresses, I've got on IP that is not assigned to any of my instances, service, or whatever, but actually, this IP is pingable and got a lot of opened ports including smtp, vnc, rdp, HTTP, and so on.</p>
  <p>How the hell I can check where this IP is used and for what purpose?</p>