These are some frequently asked questions with links to their answer pages.
- How should Nmap be capitalized?
- What is Nmap's license?
- How can I get started contributing code to Nmap?
- What does "tcpwrapped" mean?
- Why does Nmap show some of my ports as "filtered"?
- How can I evade IDS/IPS/firewalls?
- I know this port is open, so why doesn't Nmap show it as open?