Search and browse TCP/UDP well-known port numbers, service names, and protocol information · Pure frontend · Data stays local
Pure Frontend·Offline Capable0 ports found
| Port | Protocol | Service | Description |
|---|
Common Port Reference - TCP/UDP Well-Known Ports
This free online tool provides a quick reference for well-known TCP and UDP ports (0-1023). Perfect for network engineers, system administrators, and developers who need to look up port information.
Features
- Search by port number or service name
- Filter by TCP, UDP, or both protocols
- Real-time filtering and count
- Detailed port descriptions
- Pure client-side processing
When to use Common Port Reference
- Configuring firewall rules
- Troubleshooting network services
- Learning network protocols and ports
- Security audit and port scan analysis
- Server and network device configuration
FAQ
What are well-known ports?
Well-known ports (0-1023) are assigned by IANA for standard network services. They typically require administrative privileges to use.
What's the difference between TCP and UDP?
TCP provides reliable, connection-oriented communication. UDP provides fast, connectionless communication. Many services support both protocols.
What are Registered and Dynamic ports?
Registered ports (1024-49151) are registered by IANA for specific services. Dynamic/Private ports (49152-65535) are for temporary use.