Network Port Reference - Common Ports Guide
Comprehensive reference guide for common network ports and services. Search and learn about FTP, SSH, HTTP, HTTPS, database ports, and more.
Port Reference Tool
This is a reference tool showing common network ports and their services. For actual port scanning, use dedicated tools like nmap.
Common Network Ports
| Port | Service | Description |
|---|---|---|
| 21 | FTP | File Transfer Protocol |
| 22 | SSH | Secure Shell |
| 23 | Telnet | Telnet Protocol |
| 25 | SMTP | Simple Mail Transfer Protocol |
| 53 | DNS | Domain Name System |
| 80 | HTTP | Hypertext Transfer Protocol |
| 110 | POP3 | Post Office Protocol v3 |
| 143 | IMAP | Internet Message Access Protocol |
| 443 | HTTPS | HTTP Secure |
| 445 | SMB | Server Message Block |
| 3306 | MySQL | MySQL Database |
| 3389 | RDP | Remote Desktop Protocol |
| 5432 | PostgreSQL | PostgreSQL Database |
| 6379 | Redis | Redis Database |
| 8080 | HTTP-Alt | HTTP Alternate |
| 27017 | MongoDB | MongoDB Database |
Port Security Tips
- • Close unused ports to reduce attack surface
- • Use firewalls to restrict port access
- • Monitor open ports regularly
- • Keep services on standard ports updated
Understanding Network Ports
Network ports are virtual endpoints for network communications. They allow multiple services to run on a single IP address by using different port numbers. Ports range from 0 to 65535, with well-known ports (0-1023) reserved for common services.
Port Categories
Well-Known Ports
0-1023: Reserved for system services and common protocols
Registered Ports
1024-49151: Assigned by IANA for specific services
Dynamic Ports
49152-65535: Used for temporary connections
Port Security Best Practices
- Close Unused Ports: Reduce attack surface by closing unnecessary ports
- Use Firewalls: Configure firewalls to restrict port access
- Change Default Ports: Consider using non-standard ports for added security
- Monitor Traffic: Regularly monitor port activity for suspicious behavior
- Keep Updated: Ensure services running on ports are up-to-date