Reconnaissance In Virtual Space
An anonymous reader writes "Whitedust Security have released an interesting article discussing online reconnaissance techniques. From the article: 'Sometimes thirty-two bits are all you need. This is a guide to Internet reconnaissance - a guide to finding out as much as you can concerning a target via the Internet'."
There is very little here besides:
man nslookup
man whois
Try those commands for a more complete understanding of what's going on.