🌐
連接埠參考
IANA Official包含安全風險等級的 IANA 連接埠資料庫。
- Security Flags
- Client-Side Only
Search Ports
Quick Stats
Total Ports
0
Filtered
0
Results
| Port | Service | Protocol | Description | Risk |
|---|---|---|---|---|
| Start typing to search for ports... | ||||
Top 50 Most Common Ports
Port Number Ranges
| Range | Name | Description |
|---|---|---|
0-1023 | Well-Known | Reserved for system services (HTTP, SSH, etc.) |
1024-49151 | Registered | User-registered ports for applications |
49152-65535 | Dynamic/Private | Ephemeral ports for client connections |
High Risk Ports
| Port | Service | Risk |
|---|---|---|
21 | FTP | Unencrypted file transfers |
23 | Telnet | Plain text authentication |
25 | SMTP | Email spam relay risk |
53 | DNS | DDoS amplification attacks |
445 | SMB | Ransomware propagation |
3389 | RDP | Brute force attacks |
Security Best Practices
- Close unused ports: Reduce attack surface by disabling services you don't need
- Use firewalls: Implement network-level access controls
- Monitor traffic: Log connections to sensitive ports (22, 443, 3389)
- Prefer encrypted protocols: Use SSH (22) instead of Telnet (23), SFTP instead of FTP
- Change defaults: Consider non-standard ports for SSH/RDP (security through obscurity)
Related Tools
IP Subnet Planner
Calculate IPv4/IPv6 subnets and ranges.
Curl Studio
Parse and generate curl commands.
DNS Record Reference
Interactive reference for DNS record types with syntax, examples, and command builders.
CSP Header Builder
Interactive Content-Security-Policy builder with directive explanations.