[pnz1]

I have a dumb question, but whenever there's an unidentified aircraft being tracked do they normally know what type of aircraft it is?

[Mamzelle]

There are more knowledgeable here to ask...but apparently so. That's good to know.

[HairOfTheDog]

I have a dumb question, but whenever there's an unidentified aircraft being tracked do they normally know what type of aircraft it is?

Not if he's unidentified. You could make some assumptions of general type by speed and altitude, but if they aren't in communication, all they get is a radar reflection. If he has been in communication, they'll tag him with his stated type and his number.

[ProudVet77]

do they normally know what type of aircraft it is?

The military has that ability.