Understanding the Well-Known Ports for TCP and UDP Communication: A Comprehensive Guide

What is the complete range of TCP and UDP well known ports?

The well-known ports for TCP and UDP are defined within the Internet Assigned Numbers Authority (IANA) registry.

These ports are standardized and commonly used by various applications and services to communicate over the network.

The complete range for well-known TCP ports is from 0 to 1023, while for UDP it is also from 0 to 1023. These ports are reserved for specific protocols or services, such as HTTP (port 80), HTTPS (port 443), FTP (port 21), SMTP (port 25), DNS (port 53), and so on. The range up to 1023 is considered privileged, and only root or administrative access is typically required to bind to these ports.

Beyond the well-known ports, there are also registered and dynamic ports. Registered ports range from 1024 to 49151, and they are typically used by applications that are not part of the IANA-defined well-known ports. Dynamic or private ports range from 49152 to 65535 and are used for temporary connections or for client-side ports.

It’s important to note that these port ranges are not absolute restrictions, and applications can use ports outside these ranges if needed. However, using well-known ports for their defined purposes helps ensure interoperability and ease of network administration.

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