Port Scanner
Check whether common ports are reachable on any public host. Scan web, mail, database and other standard ports. Browser-based, no software needed.
🌐 Network & Web Tools
Free
Browser-based
⚠ Browser limitation: Web browsers cannot open raw TCP connections, so this tool checks port reachability via HTTP/HTTPS requests. Results indicate whether a port serves HTTP traffic, not whether it is open at the TCP level. Use
nmap for full TCP port scanning.
Common Port Reference
| Port | Service | Protocol |
|---|---|---|
| 80 | HTTP | Web traffic (unencrypted) |
| 443 | HTTPS | Web traffic (encrypted) |
| 22 | SSH | Secure shell remote access |
| 21 | FTP | File Transfer Protocol |
| 25 | SMTP | Email sending |
| 3306 | MySQL | Database server |
| 5432 | PostgreSQL | Database server |
| 6379 | Redis | In-memory data store |
Browser Scanning Limitations
Browsers cannot open raw TCP connections — they only communicate via HTTP/HTTPS. This scanner checks if a service responds to an HTTPS request on a given port. Ports serving HTTPS will show as reachable; SSH, FTP and database ports will always show as unreachable regardless of whether the service is running, because they don't speak HTTP.