Welcome to Know Your Ports. KYP is a study tool devoted specifically to helping I.T. students memorize common network ports.

There is no methodology for calculating port numbers, so memorization of network ports and related port numbers is important. Of course, your specific job or requirements will determine which ports are important for you to know.
Here we've focused on some of the most commonly used ports.
*It's important to note that this list is unofficial and may deviate from the iana port assignments.