Creampuff, apologies for the delay.
Without boring everyone with a long list of Yxxx's, if you have OZRunways, try putting up the WAC Chart, zoom into the northern part of the NT, lets say from a line north of Roper River to the east and to Port Keats in the west, then go to the left side list of display items and turn on the second icon from the top (ALA's etc.)-
More than a hundred airstrips not shown on the WAC will be displayed.
Try it for yourself.
Of course your next question will be. Yes but how many VFR aircraft are active daily in the NT?
Well, as Brian said, when asked how much he hated the Romans, A LOT.