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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?

studiohack
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Evan Fosmark
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5 Answers5

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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 '11 at 03:20
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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 '14 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 '15 at 08:42
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    You also need an sudo on the lsof line, else it will silently fail. – medoc Dec 12 '23 at 18:07
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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))
Oleksandr
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10
netstat -lp
Nick
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3

In Linux, To find a process running on a port, do below:

lsof -i :<port_number>

example:

lsof -i :8080
Slye
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Amit Kaneria
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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 06 '16 at 00:22
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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
caffeine
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