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# Find which process is using a specific port
- URL: https://www.bagz.fr/find-which-process-is-using-a-specific-port/
- Published: 2015-02-11T11:31:57.000Z
- Updated: 2015-02-11T11:31:57.000Z
- Author: bgazui
- Tags: Linux, #Migrated-1790668826633, #wp, #wp-post, #Import 2026-09-29 08:00

If you need to know/find which process is using a specific port on your system, you can use some default tools for troubleshooting:

- netstat
- lsof
WARNING 

: For the use of these tools, you will need root rights (or sudo rights will be efficient)

First, with **netstat** you can use options *tnlpu* to display much informations on connections:

$ sudo netstat -tlnpu  
Active Internet connections (only servers)  
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name  
tcp 0 0 127.0.0.1:9000 0.0.0.0:\* LISTEN 5786/php-fpm: pool  
tcp 0 0 127.0.0.1:27017 0.0.0.0:\* LISTEN 18591/mongod  
tcp 0 0 0.0.0.0:8080 0.0.0.0:\* LISTEN 15481/python  
tcp 0 0 0.0.0.0:8081 0.0.0.0:\* LISTEN 19238/nginx  
tcp 0 0 0.0.0.0:22 0.0.0.0:\* LISTEN 1105/sshd  
tcp 0 0 127.0.0.1:5432 0.0.0.0:\* LISTEN 15098/postgres  
tcp6 0 0 :::22 :::\* LISTEN 1105/sshd  

Then, with **lsof** you can easily find which connections are opened on a specified port with the option *\-i* on your command-line:

$ sudo lsof -i tcp:22  
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME  
sshd 1054 root 3u IPv4 9672 0t0 TCP \*:ssh (LISTEN)  
sshd 1054 root 4u IPv6 9674 0t0 TCP \*:ssh (LISTEN)  
sshd 1146 root 3u IPv4 9794 0t0 TCP 192.168.56.101:ssh->192.168.56.1:49931 (ESTABLISHED)  
sshd 1150 root 3u IPv4 9876 0t0 TCP 192.168.56.101:ssh->192.168.56.1:49933 (ESTABLISHED)  
sshd 1254 admin 3u IPv4 9794 0t0 TCP 192.168.56.101:ssh->192.168.56.1:49931 (ESTABLISHED)  
sshd 1265 admin 3u IPv4 9876 0t0 TCP 192.168.56.101:ssh->192.168.56.1:49933 (ESTABLISHED)