- Passive information gathering involves using publicly accessible data, while active information gathering involves interacting with the target system.
- Shodan and Maltego.
- Nmap allows you to conduct vulnerability scans that leverage the Nmap scripting engine.
- OpenVAS and Nessus.
- Performing packet capturing allows you to view the raw packets as it traverses a network. Some packets can expose data, such as clear text passwords and other interesting information.