External Service Auditor

Scan domains for standard service vulnerabilities. Identify open entry points for HTTP, SSH, FTP, and Database listeners.

Querying Port States via Socket Simulation...

Understanding Port Scanning

Port Scanning is a method used by engineers and security researchers to identify which ports on a network are open and listening to connections. Each port is associated with a specific service type (e.g. 22 for SSH, 80 for HTTP).


TCP vs UDP: TCP scans are connection-oriented and require a 3-way handshake. UDP scans are "best-effort" and harder to detect. For security, any port that isn't strictly required for public service should be closed or firewalled.

? How to Use Port & Service Scanner | Network Lab

  1. Open the networking tool in your browser.
  2. Enter the IP address, domain, subnet, or network data.
  3. Select the calculation or lookup type you need.
  4. Click the action button to get instant results.
  5. Copy or export the network information for your records.

✓ Why Use This Tool

  • 100% Free — No account, subscription, or payment required.
  • Privacy First — All processing happens in your browser. Your files never leave your device.
  • No Installation — Works directly in any modern browser on any device.
  • Instant Results — Get your output in seconds without waiting for server processing.

Frequently Asked Questions

Can I use these networking tools without installing any software?

Yes. All IT and networking tools run directly in your browser. There is nothing to install, no configuration required, and they work on any operating system.

How accurate is the network diagnostic information?

The tools query live DNS resolvers and use your browser's network APIs for real-time data. Results reflect your actual network conditions at the time of the query.

Can IT professionals use these tools for client network diagnostics?

Yes. These tools are designed for professional use and provide accurate, real-time network information suitable for diagnosing DNS misconfigurations, IP conflicts, and connectivity issues.