Port Checker (Open Port Test)

Check if a port is open on a domain or IP with instant results.

No data stored Instant results Mobile-friendly

Calculator

Status

Idle

Checked Protocols

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Open Ports

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Closed/Filtered

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Latency (avg)

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Attempts

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Host

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Ports Scanned

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How it works

Enter a host and a list of ports. The scanner tries browser HTTP/HTTPS/WebSocket requests to each port and reports which ports responded. Results are for informational purposes only.

FAQ

What does an open port mean?

An open port indicates a service is listening on that port and reachable from the network.

Why might a port appear closed when it is open?

Firewalls, NAT, or protocol restrictions can block probes, so a port may be open but still unreachable from your location.

Which ports should I test?

Start with common ports like 80, 443, 22, 25, 53, and 3306 depending on the service you expect.

Is this tool free to use?

Yes. This port checker is free and does not require an account.