Sam Spade is also a graphical tool which allows you to do DNS interrogation and many other things. The features which make Sam Spade a key security tool are: Advanced DNS - DIG tool requests all the DNS records for a host or domain Zone Transfer - ask a DNS server for all it knows about a domain SMTP Relay Check - check whether a mail server allows third party relaying Scan Addresses - scan a range of IP addresses looking for open ports Crawl Web site - search a Web site, looking for email addresses, offsite links, download a Web site Search IP block - finds the IP block for an organization Sam Spade also does whois, traceroute, finger and dns lookup.