Whois queries are used to determine the IP address ranges associated with clients. A whois query can be run on most UNIX environments. In a Windows environment, the tools such as WsPingPro and Sam Spade can be used to perform whois queries. Whois queries can also be executed over the Web from www.arin.net and www.networksolutions.com.

Explore More

What are worms?

Worms are programs that replicate themselves from one system to another without using a host file. Although in most cases worms exist inside files, such as Word or Excel documents,

You’ve Hired a Hacker (Section 3)

Section 3: Productivity 3.1: My hacker plays video games on company time. Abraham Lincoln said, “If I had ten hours to chop down an oak tree, I’d spend the first

Wall off the World—Install a Better Firewall in an Afternoon

More advanced firewalls can be time-consuming to install, but they are not difficult to use. Take the time to fortify your defenses. It is really worthwhile.Install a Two-way Software Firewall