If I understand correctly, you just want: use Socket qw(inet_aton);
my $lower = inet_aton("192.168.1.0");
my $upper = inet_aton("192.168.99.255");
while (<DATA>) {
chomp;
my $ip = inet_aton($_);
print "$_\n" if $lower le $ip and $ip le $upper;
}
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