At a C prestige, you might be able to do it if you stick to the high-100s (170+) or so. You'll have a better shot at higher ranked recruits with better prestige, but it's always worth a phone call at least.
If one of them returns your call and give you the backup message, be prepared to send 1.5 to 3 times as many scouting trips to be considered. In the last 3 seasons in my region on Smith, I've actually found that there were better players unranked than ranked, strictly going on potentials.
In any event, if you go after ranked D1 players, brace yourself to be sniped by lower D1 programs that are scrambling to fill their benches. If you're lucky, you can pull it off.