How to Quickly Detect Occupied Ports on Linux with Python
This guide shows how to use Linux commands like lsof and netstat to identify occupied ports and provides a Python script that monitors specific IP ports for availability, complete with example outputs and explanations of key parameters.
How to view ports in Linux
I wanted to write a small Python program to probe ports, but first I needed to learn how to check occupied ports on Linux.
Use lsof -i:<port> to see which process uses a specific port, e.g., lsof -i:8000. The output shows that port 8000 is occupied by the lightweight file system forwarding service lwfs .
Another useful command is netstat -tunlp | grep <port>, for example netstat -tunlp | grep 8000, which lists the process details for the given port.
The following image explains the meaning of the parameters shown by netstat:
A Python script can monitor a specific IP and port to determine if it is occupied. The script’s execution result is shown below:
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