SpiderFoot is an open source intelligence (OSINT) automation tool. Its goal is to automate the process of gathering intelligence about a given target, which may be an IP address, domain name, hostname, network subnet, ASN or person’s name.
SpiderFoot can be used offensively, i.e. as part of a black-box penetration test to gather information about the target or defensively to identify what information your organisation is freely providing for attackers to use against you.

What is SpiderFoot?
SpiderFoot is a reconnaissance tool that automatically queries over 100 public data sources (OSINT) to gather intelligence on IP addresses, domain names, e-mail addresses, names and more. You simply specify the target you want to investigate, pick which modules to enable and then SpiderFoot will collect data to build up an understanding of all the entities and how they relate to each other.
What is OSINT?
OSINT (Open Source Intelligence) is data available in the public domain which might reveal interesting information about your target. This includes DNS, Whois, Web pages, passive DNS, spam blacklists, file meta data, threat intelligence lists as well as services like SHODAN, HaveIBeenPwned? and more. See the full list of data sources SpiderFoot utilises.
What can I do with SpiderFoot?
The data returned from a SpiderFoot scan will reveal a lot of information about your target, providing insight into possible data leaks, vulnerabilities or other sensitive information that can be leveraged during a penetration test, red team exercise or for threat intelligence. Try it out against your own network to see what you might have exposed!
Read more at the project website: http://www.spiderfoot.net