Nmap Port Scanner

A simple Python tool that scans a target IP or domain for common open ports, then runs Nmap service detection on any ports found open.

This is a learning project built while studying networking and cybersecurity fundamentals (first-year CS student).

How It Works

1. Performs a fast raw-socket scan on a set of common ports (21, 22, 80, 443, 8080).
2. For any ports found open, runs nmap -sV to detect the running service and its version.
3. Prints a clean summary of the results.

Requirements

• Python 3
• nmap installed on your system
• python-nmap library

Install the Python dependency:

pip install python-nmap

Usage

python3 portscan-nmap.py

You'll be prompted to enter a target IP address or domain name.

Note: The Nmap service-detection phase (-sV) may require root privileges:

sudo python3 portscan-nmap.py

Example Output

Enter target IP or domain: scanme.nmap.org

Scanning scanme.nmap.org ...

[CLOSED] Port 21
[OPEN]   Port 22
[OPEN]   Port 80
[CLOSED] Port 443
[CLOSED] Port 8080

Running Nmap on open ports...

Host: 45.33.32.156
State: up

Port 22 | ssh | OpenSSH 6.6.1p1 Ubuntu 2ubuntu2.13
Port 80 | http | Apache httpd 2.4.7

Scan Complete.

Disclaimer

Only scan systems you own or have explicit permission to test. scanme.nmap.org is Nmap's official target for practicing scans.

Author

Mohammad Alsarawi