SwiftNetScanPort Checker
Check if a port is open on a host. Includes a reference guide for common ports and their uses.
Ports 80 and 443 can be tested directly from your browser. Other ports require a dedicated tool due to browser security restrictions.
Common Ports Reference
| Port | Service | Protocol | Common Use |
|---|---|---|---|
| 21 | FTP | TCP | File transfer |
| 22 | SSH | TCP | Secure remote access |
| 23 | Telnet | TCP | Unencrypted remote access (legacy) |
| 25 | SMTP | TCP | Email sending |
| 53 | DNS | UDP/TCP | Domain name resolution |
| 80 | HTTP | TCP | Unencrypted web traffic |
| 110 | POP3 | TCP | Email retrieval |
| 143 | IMAP | TCP | Email access (with server sync) |
| 443 | HTTPS | TCP | Secure (TLS) web traffic |
| 465 | SMTPS | TCP | Secure email sending |
| 993 | IMAPS | TCP | Secure email access |
| 995 | POP3S | TCP | Secure email retrieval |
| 3306 | MySQL | TCP | MySQL database server |
| 3389 | RDP | TCP | Windows Remote Desktop |
| 5432 | PostgreSQL | TCP | PostgreSQL database server |
| 5900 | VNC | TCP | Remote desktop (VNC) |
| 6379 | Redis | TCP | Redis in-memory data store |
| 8080 | HTTP Alt | TCP | Alternative HTTP / dev servers |
| 8443 | HTTPS Alt | TCP | Alternative HTTPS port |
| 27017 | MongoDB | TCP | MongoDB database server |
Click any row to populate the port number in the checker above.
Understanding Ports
What Is a Port?
A network port is a virtual endpoint for communication on a device. It's a number (0–65535) that tells the operating system which application should handle incoming network traffic.
Open vs Closed Ports
An open port has an application actively listening for connections. A closed port refuses connections. Filtered ports are blocked by a firewall and give no response.
Why It Matters
Open ports can be security vulnerabilities if not properly secured. Port scanning is used by network admins to audit firewall rules and by attackers to find attack surfaces.