I believe you mean the 7 planes or realms of existance. And there are 3 different levels of the Astral Plane. The Lower Astral is the lowest vibratory level and is home to the bad entities and the dead who are still attached to the physical. Then there is the Middle Astral, home to the main Astral beings and structures (there are no bad entities after the Lower Astral). And the Higher Astral home to the Ascended Masters (Jesus, Buddha etc.) and the Spritual Entities (Mars, Venus, Ra, etc.) and I also encountered the Akashic Records on this Level while Projecting.
P.S. The only people who have the real knownledge of the Astral Plane and it's Levels are the people who have projected to them (Astral Travel/Astral Projection)