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What is a TCP Check?

Common questions:

  • Does my domain resolve over this port?
  • How do I check connectivity over a specific port?

How It Works

Attempts to open a TCP connection on the specified port.

Try It Yourself


For example: check HTTPS (port 443) or a domain or mail server (25).

In this screen, we are checking over port 443, which is up because we have a valid SSL certificate.

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