When we talk about satellites, we must worry about what exactly is the orbit in which satellites will be kept. The various orbits that one could think of could be anything from the surplus of the earth to the geo-stationary earth orbit, but then we find that there are two belts which are known as Van Allen belts which are the region of particles trapped in earth's magnetic field and if you put a satellite in that belt then the electronics of that will fast get degraded and therefore one does not use either inner Van Allen belt or outer Van Allen belt.
The outer Van Allen belt is approximately from 3,1 ER to 4,1 ER and the inner Van Allen is from 1,1 ER to 1,7 ER and therefore corresponding regions which should not be used are 1.913 to 4.463 kilometres and 13.393 to 19.772 kilometres up above the surface of the earth.