Well just in case you change your mind, don't be intimidated by INI's. Kix makes it real easy to read and write from them. Here's a short simple example of how you could achieve what you're trying with an INI and 2 lines of code.
 Code:
$ip = Join(Split(SubStr(@IpAddress0,1,11)," "),"")
$Server = ReadProfileString(@ScriptDir+"\subnets.ini","SUBNETS",$ip)
? $server
get $
And the INI would be names subnets.ini and look like this...
 Code:
[SUBNETS]
10.111.1 = Server1
10.11.100 = Server2
192.168.1 = TestServer