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May 25, 2016 pm 05:07 PM

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<!--
PHP Subnet Calculator v1.3.
Copyright 06/25/2003 Raymond Ferguson ferguson_at_share-foo.com.
Released under GNU GPL.
Special thanks to krischan at jodies.cx for ipcalc.pl http://jodies.de/ipcalcThe presentation and concept was mostly taken from ipcalc.pl.
-->
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
		"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
  <title>PHP Subnet Calculator</title>
  <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
  <meta name="GENERATOR" content="Quanta Plus">
</head>
<body bgcolor="#D3D3D3">
<center>
<form method="post" action="<?php print $_SERVER[&#39;PHP_SELF&#39;] ?> ">
<BR><BR>
<table width="95%" align=center cellpadding=2 cellspacing=2 border=0>
  <tr><td align="center" bgcolor="#999999">
     <b><A HREF="http://sourceforge.net/projects/subntcalc/">PHP Subnet Calculator</A></b>
  </td></tr>
</table>
<BR>
<table>
  <tr>
        <td>IP &amp; Mask or CIDR:   </td>
        <td><input type="text" name="my_net_info" value="" size="31" maxlength="32"></td>
        <td>    <input type="submit" value="Calculate" name="subnetcalc">
                         
             </td>
  </tr>
</table></form><br>

<?php
//Start table
print "<table cellpadding=\"2\">\n<COL span=\"4\" align=\"left\">\n" ;

$end=&#39;</table><br><br><br><br><br><table width="95%" align=center cellpadding=2 cellspacing=2 border=0>
      <tr><td bgcolor="#999999"></td><tr><td align="center"><a href="http://validator.w3.org/check/referer">
      <img border="0" src="http://www.w3.org/Icons/valid-html401" alt="Valid HTML 4.01!" height="31" width="88"></a>
      </td></tr></table></center></body></html>&#39;;

if (empty($_POST[&#39;my_net_info&#39;])){
	tr(&#39;Use IP & CIDR Netmask: &#39;, &#39;10.0.0.1/22&#39;);
	tr(&#39;Or IP & Netmask:&#39;,&#39;10.0.0.1 255.255.252.0&#39;);
	tr(&#39;Or IP & Wildcard Mask:&#39;,&#39;10.0.0.1 0.0.3.255&#39;);
	print $end ;
	exit ;
}

$my_net_info=rtrim($_POST[&#39;my_net_info&#39;]);


//if (! ereg(&#39;^([0-9]{1,3}\.){3}[0-9]{1,3}(( ([0-9]{1,3}\.){3}[0-9]{1,3})|(/[0-9]{1,2}))$&#39;,$my_net_info)){
if (! preg_match("/^([0-9]{1,3}\.){3}[0-9]{1,3}(( ([0-9]{1,3}\.){3}[0-9]{1,3})|(\/[0-9]{1,2}))$/",$my_net_info)){
	tr("Invalid Input.");
	tr(&#39;Use IP & CIDR Netmask: &#39;, &#39;10.0.0.1/22&#39;);
	tr(&#39;Or IP & Netmask:&#39;,&#39;10.0.0.1 255.255.252.0&#39;);
	tr(&#39;Or IP & Wildcard Mask:&#39;,&#39;10.0.0.1 0.0.3.255&#39;);
	print $end ;
	exit ;
}

//if (ereg("/",$my_net_info)){  //if cidr type mask
if (preg_match("/\//",$my_net_info)){  //if cidr type mask
	$dq_host = strtok("$my_net_info", "/");
	$cdr_nmask = strtok("/");
	if (!($cdr_nmask >= 0 && $cdr_nmask <= 32)){
		tr("Invalid CIDR value. Try an integer 0 - 32.");
		print "$end";
		exit ;
	}
	$bin_nmask=cdrtobin($cdr_nmask);
	$bin_wmask=binnmtowm($bin_nmask);
} else { //Dotted quad mask?
    $dqs=explode(" ", $my_net_info);
	$dq_host=$dqs[0];
	$bin_nmask=dqtobin($dqs[1]);
	$bin_wmask=binnmtowm($bin_nmask);
	//if (ereg("0",rtrim($bin_nmask, "0"))) {  //Wildcard mask then? hmm?
	if (preg_match("/0/",rtrim($bin_nmask, "0"))) {  //Wildcard mask then? hmm?
		$bin_wmask=dqtobin($dqs[1]);
		$bin_nmask=binwmtonm($bin_wmask);
		if (ereg("0",rtrim($bin_nmask, "0"))){ //If it&#39;s not wcard, whussup?
			tr("Invalid Netmask.");
			print "$end";
			exit ;
		}
	}
	$cdr_nmask=bintocdr($bin_nmask);
}

//Check for valid $dq_host
//if(! ereg(&#39;^0.&#39;,$dq_host)){
if(! preg_match("/^0\./",$dq_host)){
	foreach( explode(".",$dq_host) as $octet ){
 		if($octet > 255){ 
			tr("Invalid IP Address");
			print $end ;
			exit;
		}
	
	}
}

$bin_host=dqtobin($dq_host);
$bin_bcast=(str_pad(substr($bin_host,0,$cdr_nmask),32,1));
$bin_net=(str_pad(substr($bin_host,0,$cdr_nmask),32,0));
$bin_first=(str_pad(substr($bin_net,0,31),32,1));
$bin_last=(str_pad(substr($bin_bcast,0,31),32,0));
$host_total=(bindec(str_pad("",(32-$cdr_nmask),1)) - 1);

if ($host_total <= 0){  //Takes care of 31 and 32 bit masks.
	$bin_first="N/A" ; $bin_last="N/A" ; $host_total="N/A";
	if ($bin_net === $bin_bcast) $bin_bcast="N/A";
}

//Determine Class
//if (ereg(&#39;^0&#39;,$bin_net)){
if (preg_match("/^0/",$bin_net)){
	$class="A";
	$dotbin_net= "<font color=\"Green\">0</font>" . substr(dotbin($bin_net,$cdr_nmask),1) ;
//}elseif (ereg(&#39;^10&#39;,$bin_net)){
}elseif (preg_match("/^10/",$bin_net)){
	$class="B";
	$dotbin_net= "<font color=\"Green\">10</font>" . substr(dotbin($bin_net,$cdr_nmask),2) ;
//}elseif (ereg(&#39;^110&#39;,$bin_net)){
}elseif (preg_match("/^110/",$bin_net)){
  	$class="C";
	$dotbin_net= "<font color=\"Green\">110</font>" . substr(dotbin($bin_net,$cdr_nmask),3) ;
//}elseif (ereg(&#39;^1110&#39;,$bin_net)){
}elseif (preg_match("/^1110/",$bin_net)){
  	$class="D";
	$dotbin_net= "<font color=\"Green\">1110</font>" . substr(dotbin($bin_net,$cdr_nmask),4) ;
	$special="<font color=\"Green\">Class D = Multicast Address Space.</font>";
}else{
  	$class="E";
	$dotbin_net= "<font color=\"Green\">1111</font>" . substr(dotbin($bin_net,$cdr_nmask),4) ;
	$special="<font color=\"Green\">Class E = Experimental Address Space.</font>";
}

//if (ereg(&#39;^(00001010)|(101011000001)|(1100000010101000)&#39;,$bin_net)){
if (preg_match("/^(00001010)|(101011000001)|(1100000010101000)/",$bin_net)){
  	 $special=&#39;<a href="http://www.ietf.org/rfc/rfc1918.txt">( RFC-1918 Private Internet Address. )</a>&#39;;
}

// Print Results
tr(&#39;Address:&#39;,"<font color=\"blue\">$dq_host</font>",
	&#39;<font color="brown">&#39;.dotbin($bin_host,$cdr_nmask).&#39;</font>&#39;);
tr(&#39;Netmask:&#39;,&#39;<font color="blue">&#39;.bintodq($bin_nmask)." = $cdr_nmask</font>",
	&#39;<font color="red">&#39;.dotbin($bin_nmask, $cdr_nmask).&#39;</font>&#39;);
tr(&#39;Wildcard:&#39;, &#39;<font color="blue">&#39;.bintodq($bin_wmask).&#39;</font>&#39;,
	&#39;<font color="brown">&#39;.dotbin($bin_wmask, $cdr_nmask).&#39;</font>&#39;);
tr(&#39;Network:&#39;, &#39;<font color="blue">&#39;.bintodq($bin_net).&#39;</font>&#39;,
	"<font color=\"brown\">$dotbin_net</font>","<font color=\"Green\">(Class $class)</font>");
tr(&#39;Broadcast:&#39;,&#39;<font color="blue">&#39;.bintodq($bin_bcast).&#39;</font>&#39;,
	&#39;<font color="brown">&#39;.dotbin($bin_bcast, $cdr_nmask).&#39;</font>&#39;);
tr(&#39;HostMin:&#39;, &#39;<font color="blue">&#39;.bintodq($bin_first).&#39;</font>&#39;,
	&#39;<font color="brown">&#39;.dotbin($bin_first, $cdr_nmask).&#39;</font>&#39;);
tr(&#39;HostMax:&#39;, &#39;<font color="blue">&#39;.bintodq($bin_last).&#39;</font>&#39;,
	&#39;<font color="brown">&#39;.dotbin($bin_last, $cdr_nmask).&#39;</font>&#39;);
@tr(&#39;Hosts/Net:&#39;, &#39;<font color="blue">&#39;.$host_total.&#39;</font>&#39;, "$special");
print "$end";

function binnmtowm($binin){
	$binin=rtrim($binin, "0");
	//if (!ereg("0",$binin) ){
	if (!preg_match("/0/",$binin) ){
		return str_pad(str_replace("1","0",$binin), 32, "1");
	} else return "1010101010101010101010101010101010101010";
}

function bintocdr ($binin){
	return strlen(rtrim($binin,"0"));
}

function bintodq ($binin) {
	if ($binin=="N/A") return $binin;
	$binin=explode(".", chunk_split($binin,8,"."));
	for ($i=0; $i<4 ; $i++) {
		$dq[$i]=bindec($binin[$i]);
	}
        return implode(".",$dq) ;
}

function bintoint ($binin){
        return bindec($binin);
}

function binwmtonm($binin){
	$binin=rtrim($binin, "1");
	//if (!ereg("1",$binin)){
	if (!preg_match("/1/",$binin)){
		return str_pad(str_replace("0","1",$binin), 32, "0");
	} else return "1010101010101010101010101010101010101010";
}

function cdrtobin ($cdrin){
	return str_pad(str_pad("", $cdrin, "1"), 32, "0");
}

function dotbin($binin,$cdr_nmask){
	// splits 32 bit bin into dotted bin octets
	if ($binin=="N/A") return $binin;
	$oct=rtrim(chunk_split($binin,8,"."),".");
	if ($cdr_nmask > 0){
		$offset=sprintf("%u",$cdr_nmask/8) + $cdr_nmask ;
		return substr($oct,0,$offset ) . "   " . substr($oct,$offset) ;
	} else {
	return $oct;
	}
}

function dqtobin($dqin) {
        $dq = explode(".",$dqin);
        for ($i=0; $i<4 ; $i++) {
           $bin[$i]=str_pad(decbin($dq[$i]), 8, "0", STR_PAD_LEFT);
        }
        return implode("",$bin);
}

function inttobin ($intin) {
        return str_pad(decbin($intin), 32, "0", STR_PAD_LEFT);
}

function tr(){
	echo "\t<tr>";
	for($i=0; $i<func_num_args(); $i++) echo "<td>".func_get_arg($i)."</td>";
	echo "</tr>\n";
}
?>

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