What type of port number is assigned by IANA to commonly used services and applications?

The type of port number assigned by the Internet Assigned Numbers Authority (IANA) to commonly used services and applications is known as a "Well-Known Port Number."

Details:

1. Range of Port Numbers: Well-known port numbers are defined in the range of 0 to 1023.
2. Usage: These ports are assigned to specific services by IANA for standardized communication across the internet. For example, HTTP uses port 80, HTTPS uses port 443, FTP uses ports 20 and 21, and DNS uses port 53.
3. Significance: The assignment of well-known port numbers helps ensure that applications can communicate effectively and consistently over the internet, allowing for proper routing of network traffic.

Additionally, there are two other categories of port numbers:

• Registered Port Numbers: These range from 1024 to 49151 and are assigned to services by IANA for specific applications or protocols but are not as widely recognized as well-known ports.
• Dynamic/Private Port Numbers: These range from 49152 to 65535 and are typically used for custom or temporary connections negotiated by applications as needed.