PHP Script - Subnet Info
========================

This is a php function for getting subnet information.

Public domain
********************************************************************************
### Syntax

        subnet_info($network, $request);

        $network can be "ip/netmask" or "ip/prefix"
        $request can be host number or one of this strings:
                ip, netmask, wildcard, prefix, netid, broadcast,
                ip_bin, netmask_bin, netid_bin, broadcast_bin,
                hosts 

********************************************************************************
### Usage example

    $network = "192.168.50.70/255.255.255.240";
    echo subnet_info($network,"ip")." : IP\n";
    echo subnet_info($network,"netmask")." : Netmask\n";
    echo subnet_info($network,"wildcard")." : Wildcard\n";
    echo subnet_info($network,"networkid")." : Network ID\n";
    echo subnet_info($network,"broadcast")." : Broadcast\n";
    echo subnet_info($network,"ip_bin")." : IP binary\n";
    echo subnet_info($network,"netmask_bin")." : Netmask binary\n";
    echo subnet_info($network,"networkid_bin")." : NetID binary\n";
    echo subnet_info($network,"broadcast_bin")." : Bradcast binary\n";
    echo subnet_info($network,"prefix_bin")." : Prefix binary\n";
    echo subnet_info($network,"prefix")." : Prefix\n";
    echo subnet_info($network,"hosts")." : Hosts\n";
    echo subnet_info($network,"12")." : Host number 12 \n";
    echo "\n";

    $network = "192.168.50.70/20";
    echo subnet_info($network,"ip")." : IP\n";
    echo subnet_info($network,"netmask")." : Netmask\n";
    echo subnet_info($network,"wildcard")." : Wildcard\n";
    echo subnet_info($network,"networkid")." : Network ID\n";
    echo subnet_info($network,"broadcast")." : Broadcast\n";
    echo subnet_info($network,"ip_bin")." : IP binary\n";
    echo subnet_info($network,"netmask_bin")." : Netmask binary\n";
    echo subnet_info($network,"networkid_bin")." : NetID binary\n";
    echo subnet_info($network,"broadcast_bin")." : Bradcast binary\n";
    echo subnet_info($network,"prefix_bin")." : Prefix binary\n";
    echo subnet_info($network,"prefix")." : Prefix\n";
    echo subnet_info($network,"hosts")." : Hosts\n";
    echo subnet_info($network,"1200")." : Host number 1200 \n";
    echo "\n";

********************************************************************************
### Output example

    192.168.50.70 : IP
    255.255.255.240 : Netmask
    0.0.0.15 : Wildcard
    192.168.50.64 : Network ID
    192.168.50.79 : Broadcast
    11000000.10101000.00110010.01000110 : IP binary
    11111111.11111111.11111111.11110000 : Netmask binary
    11000000.10101000.00110010.01000000 : NetID binary
    11000000.10101000.00110010.01001111 : Bradcast binary
    11111111.11111111.11111111.11110000 : Prefix binary
    28 : Prefix
    16 : Hosts
    192.168.50.75 : Host number 12
    
    192.168.50.70 : IP
    255.255.240.0 : Netmask
    0.0.15.255 : Wildcard
    192.168.48.0 : Network ID
    192.168.63.255 : Broadcast
    11000000.10101000.00110010.01000110 : IP binary
    11111111111111111111000000000000 : Netmask binary
    11000000.10101000.00110000.00000000 : NetID binary
    11000000.10101000.00111111.11111111 : Bradcast binary
    11111111111111111111000000000000 : Prefix binary
    20 : Prefix
    4096 : Hosts
    192.168.52.175 : Host number 1200

********************************************************************************
### subnet_info function
    
    <?php
    
    function subnet_info($network,$request)
    {
        $slash_pos = strpos($network, '/');
        $netmask = substr($network, $slash_pos + 1);
        $ip = substr($network, 0, $slash_pos);
    
        // Change prefix to netmask
        if (strpos($netmask, '.') === false) {
                $prefix =  intval($netmask);
                $prefix_binary = str_pad(str_pad("",  $prefix, "1", STR_PAD_LEFT), 32, "0");
                $netmask = bindec (substr ($prefix_binary, 0 ,8));
                $netmask = $netmask.".".bindec (substr ($prefix_binary, 8 ,8));
                $netmask = $netmask.".".bindec (substr ($prefix_binary, 16 ,8));
                $netmask = $netmask.".".bindec (substr ($prefix_binary, 24 ,8));
        }
    
        $ip_array = explode('.', $ip);
        $netmask_array = explode('.', $netmask);
    
        $hosts = 1;
        for($i=0; $i<4; $i++)
        {
                $ip_quarter = $ip_array[$i];
                $netmask_quarter = $netmask_array[$i];
    
                $ip_binary_array[$i] = str_pad(decbin($ip_quarter), 8, "0", STR_PAD_LEFT);
                $netmask_binary_array[$i] = str_pad(decbin($netmask_quarter), 8, "0", STR_PAD_LEFT);
    
                $netmask_quarter = intval($netmask_quarter);
                $ip_quarter = intval($ip_quarter);
    
                $count = 256 - $netmask_quarter;
                $begin = intval($ip_quarter / $count) * $count;
                $end = $begin + $count - 1; 
                $hosts *= $count;
    
                $begin_array[$i] = $begin;
                $end_array[$i] = $end;
    
                $begin_binary_array[$i] = str_pad(decbin($begin), 8, "0", STR_PAD_LEFT);
                $end_binary_array[$i] = str_pad(decbin($end), 8, "0", STR_PAD_LEFT);
    
                $wildcard_array[$i] = $netmask_quarter ^ 255;
        }
    
        $networkid = implode('.', $begin_array);
        $broadcast = implode('.', $end_array);
        $wildcard = implode('.', $wildcard_array);
    
        $networkid_binary = implode('.', $begin_binary_array);
        $broadcast_binary = implode('.', $end_binary_array);
    
        $ip_binary = implode('.', $ip_binary_array);
        $netmask_binary = implode('.', $netmask_binary_array);
    
        if (!isset($prefix)) {
                $prefix_binary = $netmask_binary;
                $prefix = 0;
                for($i = 0; $i < 32; $i++)
                        if($prefix_binary[$i] == "1")
                                $prefix++;
        }
    
        switch (strtolower($request)) {
                case "ip" :
                        return $ip;
                        break;
                case "netmask" :
                case "mask" :
                        return $netmask;
                        break;
                case "prefix" :
                        return $prefix;
                        break;
                case "netid" :
                case "network" :
                case "networkid" :
                        return $networkid;
                        break;
                case "broadcast" :
                        return $broadcast;
                        break;
                case "ipbin" :
                case "ip_bin" :
                        return $ip_binary;
                        break;
                case "netmaskbin" :
                case "netmask_bin" :
                case "maskbin" :
                case "mask_bin" :
                case "prefix_bin" :
                case "prefixbin" :
                        return $prefix_binary;
                        break;
                    case "netid_bin" :
                    case "network_bin" :
                    case "networkid_bin" :
                            return $networkid_binary;
                            break;
                case "broadcast_bin" :
                case "broadcastbin" :
                        return $broadcast_binary;
                        break;
                case "wildcard" :
                        return $wildcard;
                        break;
                case "hosts" :
                case "count" :
                        return $hosts;
                        break;
                default :
                        $request = intval($request);
                        $num = 0;
                        for ($j[0] = $begin_array[0]; $j[0] <= $end_array[0]; $j[0]++)
                        for ($j[1] = $begin_array[1]; $j[1] <= $end_array[1]; $j[1]++)
                        for ($j[2] = $begin_array[2]; $j[2] <= $end_array[2]; $j[2]++)
                        for ($j[3] = $begin_array[3]; $j[3] <= $end_array[3]; $j[3]++) {
                            $host_ip = "$j[0].$j[1].$j[2].$j[3]";
                            $num++;
                            if ($request == $num) return $host_ip;
                        }
        }
    }
        
    ?>
    
********************************************************************************
_BY: Pejman Moghadam_  
_TAG: php_  
_DATE: 2012-07-02 18:14:16_