lpress writes "All botnets are evil, right? Not Carna. It crawled the Internet ethically without doing harm and gathered a ton of interesting data. For example, Carna counted pingable IP addresses, those behind firewalls and those with reverse DNS records, for a total of 1.3 IP addresses in use. The anonymous author has also posted a description of the Carna methodology and results. There are also maps and dynamic graphics and all the data is available for download."
In seeking the unattainable, simplicity only gets in the way.
-- Epigrams in Programming, ACM SIGPLAN Sept. 1982