Did you test the wildcard option out and did it work? I have the same question. I have a ton of servers around various locations worldwide that all have the same last two octets of x.x.233.218. I'm trying to get the system to alert me when any of the volumes on these Win servers is less than 5%. I wanted to do it on all the servers in one Node_Function but you can't mix property types in an alert so I went with a contains IP search. See screenshot.
Regards,
-Zac A.