Port Numbers Reference

The Port Numbers Reference tool provides quick access to well-known TCP and UDP port numbers along with their associated service names and descriptions. Network administrators, developers, and IT professionals regularly need to identify which application or service uses a specific port, whether for troubleshooting network connectivity issues, configuring firewalls, or understanding network traffic patterns.

To use this tool, simply enter a port number or search for a service name to find its standard port assignment. The tool instantly displays the transport protocol (TCP, UDP, or both), the official service name, and a brief description of what the service does. This is especially useful when you encounter an unfamiliar port in your network logs or need to verify the correct port for a specific application before configuring it.