Port Scanner

How to Use the Port Scanner

1. Enter the target hostname or IP address in the "HOST / IP" field.
2. Select a preset (Common, Web, Mail, Database) or choose "Custom Range" for specific ports.
3. If using custom range, enter the starting and ending port numbers (max 200 ports).
4. Click "Scan Ports" to begin scanning.
5. View results in real-time as each port is checked — open ports are highlighted in green.
6. Use the "Stop" button to cancel a scan in progress.

Technical Overview & Use Cases

The Port Scanner uses Cloudflare Workers to perform TCP connection attempts against specified ports on a target host. Each port is probed sequentially and results indicate whether the port is open (accepting connections) or closed. Common services are automatically identified by port number.

• Server Administration: Verify which services are exposed on your server and identify unnecessary open ports that could pose security risks.
• Firewall Verification: Confirm that firewall rules are correctly blocking or allowing traffic on specific ports after configuration changes.
• Service Discovery: Identify running services on a network host by detecting open ports and their associated protocols (HTTP, SSH, MySQL, etc.).

Privacy & Security Guarantee

This tool is part of the FAK LAB ecosystem, founded by Faizan Ahmad Khan Khichi. Port scans are executed via secure Cloudflare Workers — no scan data, targets, or results are stored or logged. The interface runs 100% client-side, ensuring your security assessments remain completely private.

Frequently Asked Questions

Is port scanning legal?

Port scanning your own servers and authorized systems is perfectly legal. Always ensure you have permission before scanning third-party hosts. This tool is intended for legitimate network administration and security auditing.

Why are some ports showing as closed?

A closed port means no service is listening on that port, or a firewall is blocking the connection. This is normal — most ports on a server should be closed unless a specific service needs them.

What is the difference between presets?

Presets group ports by category: "Common" covers the 20 most frequently used ports, "Web" targets HTTP/HTTPS services, "Mail" checks email protocols, and "Database" scans for database services like MySQL, PostgreSQL, and MongoDB.