Network Port Scanner: Audit Common Ports & Socket Services

Target Host or IP Address

Port Profile

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Port Diagnostic & Vulnerability Scanner

Select a port profile and click "Scan Ports" to test firewall posture and service availability.

Auditing open TCP socket ports helps network administrators identify exposed services, misconfigured firewalls, and server security vulnerabilities. 99tools Port Scanner provides simulated and live diagnostic probes for standard application ports (80, 443, 22, 21, 3306).

Quick Guide

How to Use Network Port Scanner: Audit Common Ports & Socket Services in 3-4 Simple Steps

Enter IP or Hostname

Type the server IP address or public hostname.

Select Ports

Scan common ports (80, 443, 22, 21, 3306) or custom port ranges.

Inspect Status

Review open, filtered, or closed socket states.

Need Help?

Frequently Asked Questions

Everything you need to know about this tool, accuracy, formulas, and privacy.

What does an open network port mean?

An open port indicates that an application or network service on the target machine is actively listening for incoming connection requests on that specific socket.

Network Port Scanner: Audit Common Ports & Socket Services

Port Diagnostic Results

How to Use Network Port Scanner: Audit Common Ports & Socket Services in 3-4 Simple Steps

Enter IP or Hostname

Select Ports

Inspect Status

Frequently Asked Questions

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