Port Scanner

A TCP port scanner written in C.

It scans a target IP across a port range and reports which ports are open.

Features

• Interactive input for target IP and port range
• Non-blocking connection checks with timeout
• Prints each open port as it is detected
• Shows total number of open ports

Build

gcc main.c scanner.c network.c  -o scanner

Run

./scanner

Example Input

Enter target IP: 127.0.0.1
Enter start port: 2995
Enter end port: 3005

Example Output

Scanning 127.0.0.1 from port 2995 to 3005...

Port 3000 is OPEN

Total open ports: 1

Scan completed.

Output Screenshot

Project Files

• main.c - CLI input and scan start
• scanner.c - Port scanning loop and open-port reporting
• network.c - Socket and target setup helpers
• scanner.h, network.h - Header files