In the previous post we considered the theoretical cost and feasibility of scanning all Internet IP addresses and it resulted to be very low. Therefore, we decided to conduct a little experiment: see if it was possible to scan the entire Internet, of course without doing anything harmful.
While the action may not be completely harmless (some may have IDS complaning), we have tried to do the experiment as innocuous as possible. In this sense, the safest action we thought was to launch a ping (ICMP echo) to each and every one of the Internet IP addresses. Although we have sent just a single packet per IP, we messed the scans to prevent a network receiving a high number of consecutive packets.
To do so we prepared two threads, in which work I have had the invaluable help of Nacho López, an experienced C programmer.
read more.......http://www.securityartwork.es/2013/02/07/the-result-of-pinging-all-the-internet-ip-addresses/?lang=en