Antwerpen and Brussels are no-Fly-zones in a wide area, Belgium law says: drone -1kg is allowed above own territory until 10m.
All the rest needs license and registration, class 2 until 50m(150ft) or class 1 until 95m(350ft).
With the usual restrictions..., 50m away from any person, animal or objects, no flying above agglomerations, stay away 5km of any airport activities ...aso.
I will try to add a Belgocontrol map with the NoFly zones in pink...