To know which port numbers are currently in use, use one of these:. It means that some service is listening to that port on your computer for incoming connection i. Remember netstat -a will show all active listening and passive non-listening connections i. To view socket info you can check man ss. Another option is ss.
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It's much easier to use Actually there is a better way to see what ports you have open. The issue with netstat or lsof is that they query network stack and actually do not connect to the machine but instead trying to see what is running on the system. The better approach is to use nmap like so:. Ubuntu Community Ask!
List open TCP/UDP ports
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I used netstat -a on command line. Is any port, that is not shown in the output, closed? Router Router 3 3 gold badges 9 9 silver badges 6 6 bronze badges. Check this post on AskUbuntu! Justgivemeaname: nmap is a tool to check for open ports on another host. If you can run netstat on a machine, it's much faster and reliable to use it.
DavidFoerster: Didn't know about netstat , so I learned that. It says in the link that it should be used from another host, though. Posted on Jan 20, PM. Jul 7, PM in response to matiaspg In response to matiaspg. Even this post is rather old, but it still comes up with the search results so I would like to reply a solution to the question. You can open the Terminal in Mac type terminal on Spotlight and then use NetCat command by typing like a sample below to test your specific port like this replacing 1xx with your target IP address, then the port to check.
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May 10, AM. May 10, PM in response to avp In response to avp In OS X To quicky find it in Mavericks, use Spotlight search and enter Network Utility in the search box. In this example, the 1st line exhibits a connexion from my Mac toward So, this is what I quick put together:.
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It's a bit overkill, so I added color to the output for good measure. Since I'm not going to be able to remember, or want to type, this behemoth. I put it in a bash function and then just call that when needed.
Here is said bash function:. This is being added to the collection. Home Questions Tags Users Unanswered. How can I list my open network ports with netstat? Ask Question. Jonas Jonas 1, 7 7 gold badges 24 24 silver badges 31 31 bronze badges. However, the output is quite hard to read, but lsof was a bit better, thanks. You need to use sudo lsof Without the sudo, lsof can only see processes you own, and hence won't show any ports opened by system processes.