Network · Ports

Reachability check.

Browsers can't open raw TCP, but we can verify whether an HTTPS endpoint responds. Useful for confirming a host is reachable from your network.

Browsers restrict raw TCP and arbitrary ports. We check HTTPS reachability — a successful response means the host is reachable from your network and accepting TLS on its endpoint.

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Runs entirely in your browser. Nothing is sent to our servers.