So, if you put the example code in a file called Iteratedriver.pl, then invoke it with a couple of your examples (my version of Windows requires me to invoke with 'perl' leading any command with args:

C:\Documents and Settings\martyg\My Documents\my scripts\Perl>perl Ite
+ratedriver.pl "172.<-{19..21}->.254.<-{2..3}->" "192.168.1.<-{1..3}->
+"
172.19.254.2
172.19.254.3
172.20.254.2
172.20.254.3
172.21.254.2
172.21.254.3
192.168.1.1
192.168.1.2
192.168.1.3
C:\Documents and Settings\martyg\My Documents\my scripts\Perl>
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