Summary
port
- logical construct that identifies a specific process or service on a host
Port Numbers
| port group | range | description |
|---|---|---|
| Well-know Ports | 0-1023 | - common/popular services - common server applications, so clients easily identify the associated service required |
| Registered Ports | 1024-49151 | - Requesting entity to use with specific processes/applications assigned by IANA. - Every developers to know exactly where to send data. - e.g. Cisco has registered port 1812 for RADIUS server authentication process, Microsoft SQL Server has port 1433. |
| Private/Dynamic Ports | 49152-65535 | - Client’ OS assign port numbers dynamically when a connection to a service is initiated. - To identify the client application during communication - e.g. each tab in a browser has its own dynamic port assigned to |