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nmap is a wicked cool multiplatform port scanning utility, very useful for homemade server projects and to see if your router is properly configured.
It also has a GUI called Zenmap wich is even easier to use and offers some extra options like a fisheye map.
Remember to use your external IP if you want to see if ports are open to the internet. Scanning your LAN address won't show the same things.
- In the movie Matrix, Trinity uses nmap to find out SSH runs in port 22 of all things.