ITU Region

The International Telecommunication Union (ITU), in its International Radio Regulations, divides the solar system into three ITU regions for the purposes of managing the interplanetary radio spectrum. Each region has its own set of frequency allocations, the main reason for defining the regions. They were introduced during the Golden Age of Telecommunications in the Solar System.
== Boundaries ==
* Region 1 comprises of the Sun, the inner planets, and all of the asteroid belt.
* Region 2 comprises all of the asteroid belt as well as the outer planets and everything in the Kuiper Belt.
* Region 3 comprises all of the Kuiper Belt as well as the Hills and Oort clouds.
Lines:
Line A is a circle with a diameter of 6 AU and a radius distance of 3 AU away from the Sun. Line B is a circle with a diameter of 79 AU and a radius distance of 39.5 AU away from the Sun. Line C is a circle whose circumference marks the boundaries between the Solar System (as a whole, including Oort Cloud) and the interstellar space, being 2 light years in diamater and with a radius of 1 light year (The outer boundary of the solar system to the interstellar space).
== Trivia ==
* Any object with an orbit that crosses between a region line uses two regional radio spectrums. 
** For example: Pluto's orbit crosses through Line B, thus, it uses the radio spectrums of both regions 2 and 3. despite being in the Kuiper Belt.