Mark -
If IP's are unknown, try building a script to PING the ip's one at a time, sending results to a text file. Then scan results file for test 'Reply from' to then invoke the next steps of the script. Bill

code:

$x=001
DO
 $ip = "192.168.201." + $x
 SHELL "PING $ip"
 $x=$x+1
UNTIL $x=256