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TCP Port Checker

Check if a TCP port is open or closed on any domain or IP address instantly.

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About This Tool

The TCP Port Checker is a free online tool that allows you to test the status of TCP ports on any domain or IP address. Simply enter the hostname or IP and the port number (1-65535), and the tool will attempt to establish a TCP connection to determine if the port is open, closed, or unreachable. This is essential for network diagnostics, server configuration, and security assessments. The tool performs real socket connections without simulations, providing accurate results in seconds.
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How to Use

  1. Enter the hostname (e.g., example.com) or IP address (e.g.,
  2. in the 'Host/Domain' field.
  3. Enter the port number (1-
  4. in the 'Port' field.
  5. Click the 'Check Port' button.
  6. View the results showing whether the port is open, closed, or if there was an error, along with details like response time.
How to use tcp port checker

Frequently Asked Questions

Find Quick Answers

What is a TCP port checker used for?
It helps diagnose network issues, verify server configurations, and check security by testing if specific ports are accessible or blocked.
Is this tool safe to use?
Yes, it only performs a single TCP connection attempt and does not store or log your data. It's for legitimate diagnostic purposes.
Why might a port show as closed?
A closed port means no service is listening on that port, or a firewall is blocking the connection. It could also indicate the host is unreachable.
Can I check multiple ports at once?
No, this tool checks one port at a time for simplicity and accuracy. For multiple ports, run separate checks.

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