The International Telecommunication Union is an old and august institution, created in 1865, making it the first ever international body.
It was created to help make the most of the then-new telegraph technology by getting countries to agree how they would deal with information that was relayed to, from and through their territories.
Having been successful in that, the ITU picked up more and more work as the human race entered the telecommunications age, eventually becoming the de facto body for telecoms, including standards, financing, metrics, and even installation.
In the same way that ICANN has change written into its structure, the ITU is notable for how it has changed over time, in many cases leading the way. It was the first United Nations organization to pull in the private sector; it values academics; it started developing new standards around the advances in technology that led to the Internet as we now know it; it tries to ensure equal participation from developing countries, as well as gender balance.