Port Checker

Scan and check open ports on any IP address or hostname with this free online port checker tool

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About This Tool

This comprehensive port checker tool allows you to scan any host or IP address for open, closed, or filtered TCP ports. Enter a hostname or IP address, specify a port range (single port or multiple ports), and set a timeout value. The tool will attempt to connect to each port and display the status in real-time. Results show which ports are open (listening), closed (not listening), or filtered (blocked by firewall). Perfect for network administrators, developers, and security professionals testing network configurations and firewall rules.

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How to Use

Enter the hostname or IP address you want to scan
Specify the port range (e.g., 80 for single port, 1-1000 for range, or 22,80,443 for specific ports)
Set the connection timeout in milliseconds (default is 2000ms)
Click 'Scan Ports' to begin the port check
View real-time results showing open, closed, and filtered ports
Review the detailed results table with port numbers, status, and service information

Frequently Asked Questions

Find Quick Answers

What is a port checker and how does it work?

A port checker is a network tool that attempts to establish TCP connections to specific ports on a target host. It determines whether each port is open (accepting connections), closed (not listening), or filtered (blocked by firewall). This tool works by creating WebSocket connections from your browser for client-side scanning, with fallback to server-side PHP socket connections when needed.

Is port scanning legal?

Port scanning your own servers or devices you have permission to test is legal. However, scanning networks or systems you don't own or have explicit permission to test may be illegal in many jurisdictions. Always ensure you have proper authorization before scanning any network.

What do the different port statuses mean?

Open: The port is actively accepting connections. Closed: The port is reachable but no service is listening. Filtered: A firewall or network device is blocking access to the port. Timeout: The connection attempt timed out before receiving a response.

Why are some ports showing as filtered?

Filtered ports typically indicate that a firewall, router, or security device is blocking connection attempts to that port. This is a security measure to prevent unauthorized access to services running on those ports.

Can I check UDP ports with this tool?

No, this tool only checks TCP ports. UDP port scanning requires different techniques as UDP is a connectionless protocol that doesn't provide reliable feedback like TCP does.

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