@ip = qw\10.0.0.1 10.1.2.3 192.168.12.5 77.75.0.1\;
@subnets = qw\10.0.0.0/24 10.1.0.0/16 192.168.0.0/12\;

foreach $ip (@ip){
    @a = split /\./, $ip;
    $di = getIp(@a);
    foreach $subnet (@subnets){
        ($a, $b) = getNetwork($subnet);
        if(($di >= $a) && ($di <= $b)){print "$ip in $subnet\n";}
    }
}

sub getIp {
    return ($_[0]*256*256*256) + ($_[1]*256*256) + ($_[2]*256) + $_[3]
+;
}

sub getNetwork {
    @a = split(/[\/|\.]/, +shift);
    return (getIp(@a[0 .. 3]), (getIp(@a[0 .. 3]) + (2 ** (32 - $a[4])
+)));
}

[download]

In reply to Re: finding if an ip is in a subnet by Lennotoecom
in thread finding if an ip is in a subnet by AltGrendel

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