The ionosphere doesn't have a fixed height, but rather a range of altitudes. It's generally considered to extend from about 50 to 1,000 kilometers (31 to 621 miles) above Earth's surface.

Here's a breakdown of the different layers within the ionosphere and their approximate heights:

* D layer: 50-90 km (31-56 miles)

* E layer: 90-150 km (56-93 miles)

* F layer: 150-1,000 km (93-621 miles)

The F layer is further divided into the F1 layer (150-250 km) and the F2 layer (250-1,000 km).

It's important to remember that the boundaries of these layers can shift depending on factors like solar activity and time of day.