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I'd like to be able to find out which process is currently using a certain port in Linux. Is there any way to do this?

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  • 3
    On Windows, the command is : netstat -anb
    – djangofan
    Dec 11, 2009 at 21:39

5 Answers 5

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You have a couple of options:

lsof -i tcp:80

will give you the list of processes using tcp port 80.

Alternatively,

sudo netstat -nlp

will give you all open network connections.

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    lsof -i | grep {username} is also very useful, i.e. lsof -i | grep apache
    – LawrenceC
    Oct 30, 2011 at 3:20
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    For anyone wondering, -n : don't resolve names, -l : display listening server sockets, -p : display PID/Program name for sockets.
    – yellavon
    May 12, 2014 at 15:18
  • I usually add -P to lsof -i tcp:$PORTNUMBER so that the port gets printed back to me as a number.
    – js.
    Jun 23, 2015 at 8:42
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    You also need an sudo on the lsof line, else it will silently fail.
    – medoc
    Dec 12, 2023 at 18:07
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netstat -lp
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    on mac you have to add a protocol option to -p. so something like: netstat -lp tcp.
    – vrish88
    May 25, 2010 at 14:59
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I am using "CentOS 7 minimal" which has nor netstat neither lsof. But a lot of linux distributions have the socket statistics command (i.e. ss).

Here is an example of execution:

# ss -tanp | grep 6379
LISTEN   0    128  127.0.0.1:6379   *:*   users:(("redis-server",pid=2531,fd=4))
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In Linux, To find a process running on a port, do below:

lsof -i :<port_number>

example:

lsof -i :8080
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  • Thanks for trying to help. This command was mentioned in the accepted answer. If you have something new, please edit your post.
    – Ben N
    Jan 6, 2016 at 0:22
0

also if you want to list running processes that are speaking TCP you can use

sudo netstat -tnp

    sudo to get processes you don't own
    -t for TCP
    -n for numeric
    -p for pid

to get processes speaking UDP replace the -t with a -u

sudo netstat -unp

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