WhoisNexus
Tools
Network Ports Guide
Common TCP/UDP ports reference
All
Web
Email
File Transfer
Remote
Database
Security
Port Ranges
0-1023:
Well-known ports (system)
1024-49151:
Registered ports
49152-65535:
Dynamic/private ports
Security Tips
✓ Close unused ports
✓ Use encrypted protocols (SSH, HTTPS)
✓ Change default ports when possible
✓ Use firewalls to restrict access