The Internet Assigned Numbers Authority (IANA) is responsible for the global coordination of the DNS Root, IP addressing, and other Internet protocol resources.

The Internet Assigned Numbers Authority (IANA) is a department of ICANN responsible  for coordinating some of the key elements that keep the Internet running  smoothly. Whilst the Internet is renowned for being a worldwide network  free from central coordination, there is a technical need for some key parts  of the Internet to be globally coordinated, and this coordination role is  undertaken by IANA.

Specifically, IANA allocates and maintains unique codes and numbering  systems that are used in the technical standards (“protocols”) that drive  the Internet.

There is a great list (very updated) of all the port numbers assigned in the world which can be found here

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