Mine

<?php
  require("../dbconnect.php");
  
  function cleanfrominput($input)
  {
      $hostname_pattern = '/^([0-9\.]+)$/';
      
      // check the posted hostname against our regex to determine validity
      if (preg_match($hostname_pattern, $input)) {
          return $input;
      } else {
          echo '<p><h2 style="color:red;">Your input appears to be invalid.<br />Only numeric (0-9),  and periods (.) are allowed.</h2></p>';
          exit();
      }
  }
  
  function listallips($cleanip)
  {
      $query = "SELECT id,assignedips,dedicatedip FROM tblhosting";
      $result = mysql_query($query) or die(mysql_error());
      
      $ipArray = array();
      
      while ($data = mysql_fetch_array($result)) {
          $hostid = $data['id'];
          
          $dedicatedip = $data['dedicatedip'];
          $assignedips = $data['assignedips'];
          
          $ipArrayInit = explode(";", trim($assignedips));
          
          if ($dedicatedip != "") {
              $ipArray[$hostid][] = $dedicatedip;
          }
          
          foreach ($ipArrayInit as $v) {
              if ($v != "") {
                  if (stristr($v, '-')) {
                      $ipArrayFinal = explode("-", trim($v));
                      foreach (range(ip2long(trim($ipArrayFinal[0])), ip2long(trim($ipArrayFinal[1]))) as $number) {
                          $ipArray[$hostid][] = long2ip($number);
                      }
                  } else {
                      $ipArray[$hostid][] = $v;
                  }
              }
          }
      }
	
	echo '<pre>';      
	print_r($ipArray);
	echo '</pre>';


      foreach ($ipArray as $hostId => $ips) {
          if (array_search($cleanip, $ips)) {
              return $hostId;
          } else {
              return '<p style="color:red;font-weight:700;">ERROR: IP Not Found.</p>';
          }
      }
  }
  
  $search4ip = $_POST['search4ip'];
  if (isset($search4ip)) {
      $cleanip = cleanfrominput($search4ip);
      print listallips($cleanip);
  } else {
      echo '<table><tr>
   <td><form action="" method="post" name="customsearch" id="customsearch">
   Enter IP</td>
   <td><input type="text" size="16" value="" name="search4ip" id="search4ip" /></td>
   <td><input type="submit" value="Search" />
   </form>
   </td>
   </tr></table>' . "\n";
  }
?>