How to Check Which Service Is Using a Port

Prerequisites

Before checking port usage, make sure you have:

• SSH access to your VPS
• Root or sudo privileges (to see all processes)

Method 1: Using netstat

Connect to your VPS:

ssh hxroot@YOUR_SERVER_IP -p 22

Check specific port:

sudo netstat -tulpn | grep :80

Output shows process name/PID.

Method 2: Using ss

sudo ss -tulpn | grep :443

Method 3: Using lsof

sudo lsof -i :22

Method 4: Using fuser

sudo fuser 80/tcp