Free Online Port Checker
NetTool
Check if a port is open on a remote host. Test common service ports.Updated 2026-03-20
Frequently Asked Questions
How does it work?
Attempts to connect to the specified host and port.
Is it accurate?
Browser-based check has limitations. Use nmap for thorough scanning.
Free?
Yes, completely free.
How to Use
- Enter domain, IP, or URL to check
- Copy data or export report
- Click Lookup or press Enter
- Check status indicators
FAQ
Is my query logged?
No. Queries processed in real time and not stored.
Can I check any domain?
Yes, any publicly accessible domain or IP. Private addresses are not reachable.
How accurate are results?
Queries authoritative sources in real time. Results reflect current network state.
Why differ from other tools?
Different tools query different servers or use different methods. We show raw responses.
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