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Open Port Scanner
Check which common TCP ports (HTTP, HTTPS, SSH, FTP, SMTP, databases…) are open on a host.
We test connectivity to 19 common ports.
Next step: IP Address Lookup →
About the Open Port Scanner
A quick check of which common TCP ports are open on a host. Open ports reveal running services; unexpected ones can be a security risk worth closing.
What this tool checks
- Tests 19 common ports (web, mail, SSH, databases…)
- Reports open, closed or filtered
- Helps spot services that shouldn't face the internet
Common ports & what runs on them
| Port | Service |
|---|---|
| 21 / 22 | FTP / SSH |
| 25 / 465 / 587 | SMTP (email sending) |
| 53 | DNS |
| 80 / 443 | HTTP / HTTPS (web) |
| 110 / 143 / 993 / 995 | POP3 / IMAP (email retrieval) |
| 3306 / 5432 | MySQL / PostgreSQL |
| 3389 | RDP (remote desktop) |
| 6379 | Redis |
| 8080 / 8443 | Alternate HTTP / HTTPS |
Frequently asked questions
Is scanning my own server legal?
Scanning hosts you own or manage is fine. Only scan systems you have permission to test.
What does 'filtered' mean?
A firewall dropped the probe without a clear answer — the port may be protected rather than simply closed.
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