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#!/usr/bin/perl
# Valid private IP ranges
my @LOCAL_IP_RANGES = ("10.0.0.0", "10.255.255.255",
"172.16.0.0", "172.31.255.255",
"192.168.0.0", "192.168.255.255");
# input: A dotted quad IP address.
# output: 0 if a public (internet) address
# : 8 if a class A private (LAN) address
# : 12 if a class B private (LAN) address
# : 16 if a class C private (LAN) address
sub get_IP_number () {
my ($dotted_quad) = @_;
my $IP_number=0;
split(/\./, $dotted_quad);
for (my $i=0; $i < 4; $i++) {
$IP_number=$IP_number+@_[3-$i]*(2**(8*$i));
}
return $IP_number;
}
while(<>) {
chop;
my $IPnumber=&get_IP_number($_);
my $class=16;
while (@LOCAL_IP_RANGES) {
my $highIPnumber = &get_IP_number(pop(@LOCAL_IP_RANGES));
my $lowIPnumber = &get_IP_number(pop(@LOCAL_IP_RANGES));
if (($lowIPnumber <= $IPnumber) && ($highIPnumber >= $IPnumber)) {
exit($class); # PRIVATE IP
} else {
$class += 4;
}
}
}
exit(0); # PUBLIC IP
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