Do I need to buy Unity Pro to buy Unity iOS Pro?

I was about to buy the Unity iOS Pro, but then this question came to my mind. Do I need Unity Pro to buy Unity iOS Pro?

Yes. For Unity iOS Pro and Android Pro, you need to have Unity Pro. If you go https://store.unity3d.com/shop/ and click on the Unity, not Unity Pro, it will tell you that you need pro.

Answer is in Unity official website: https://store.unity3d.com/shop/

To have any Unity XX Pro license, you need first (or at the same time) to buy a basic Unity Pro license.