DNS
Port Checker
Check if TCP ports are open. Host + ports → connect test.
Comma-separated. Max 10. Empty = 80,443,22, etc.
How to use
- Enter a domain, URL, or value relevant to Port Checker.
- Run the check and review the output carefully.
- Apply recommended fixes, then run the check again to verify.
Common use cases
- Pre-deployment validation for Port Checker.
- Incident triage when security checks fail in production.
- Periodic security review as part of technical SEO and hardening.
Example inputs
example.com192.168.1.1Common issues and fixes
All ports closed
Firewall may block. Check if host is reachable (ping, DNS).
Connection refused
Service not listening on port. Start the service or check config.
Recommended remediation
Common: 22 SSH, 80 HTTP, 443 HTTPS, 3306 MySQL. Close unused ports. Use firewall.
FAQ
Is Port Checker free to use?
Yes. This tool is free and can be used without account registration.
Do you store submitted values?
Only the minimum processing needed for the check. For client-side tools, data stays in your browser.
How should I use these results?
Use the output as a diagnostic baseline, apply fixes in your stack, then re-run the check to confirm remediation.