In this tutorial, we will use an example to show you how to create a port scanner using python socket.

1.Import library

import socket 
import threading

2.Set the target host

target = "127.0.0.1"   # scan local host

3.Define a function to print opened port

def port_scanner(port):
    try:
        s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        s.connect((target, port))
        print(f"Port {port} is open")
    except:
        pass

In this example code, we use socket to scan the host port and print the opened one.

4.Scan port using thread

for port in range(1,5051):
    thread = threading.Thread(target =port_scanner, args=[port])
    thread.start()

Run this code, you may get these opened ports:

Port 21 is open
Port 80 is open
Port 135 is open
Port 443 is open
Port 445 is open
Port 3306 is open
Port 5040 is open