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    位置： php 中文手册 -> php 内置函数 -> php 网络函数

    ip2long()

    (PHP 4, PHP 5, PHP 7)

    将 IPV4 的字符串互联网协议转换成长整型数字

    说明

    ip2long(string $ip_address): int

    函数ip2long()返回 IPV4 网络地址的长整型格式，从标准网络地址格式(点字符串)转化得到。

    ip2long()还可以与非完整IP进行工作。阅读» http://publibn.boulder.ibm.com/doc_link/en_US/a_doc_lib/libs/commtrf2/inet_addr.htm获得更多信息。

    参数

    $ip_address

    一个标准格式的地址。

    返回值

    返回IP地址转换后的数字或FALSE如果$ip_address是无效的。

    更新日志

    版本说明
    5.5.0Prior to this version, on Windowsip2long()would sometimes return a valid number even if passed a value which was not an (IPv4) Internet Protocol dotted address.
    5.2.10再此之前的版本,ip2long()有时会返回即使这不是一个IPV4的标准地址的数字地址。

    范例

    Example #1ip2long()例子

    <?php
$ip = gethostbyname('www.example.com');
$out = "The following URLs are equivalent:<br />\n";
$out .= 'http://www.example.com/, http://' . $ip . '/, and http://' . sprintf("%u", ip2long($ip)) . "/<br />\n";
echo $out;
?>

    显示IP地址

    第二个例子说明打印一个转换后的地址使用printf()在PHP4和PHP5的功能:

    <?php
$ip   = gethostbyname('www.example.com');
$long = ip2long($ip);
if ($long == -1 || $long === FALSE) {
    echo 'Invalid IP, please try again';
} else {
    echo $ip   . "\n";           // 192.0.34.166
    echo $long . "\n";           // -1073732954
    printf("%u\n", ip2long($ip)); // 3221234342
}
?>

    注释

    Note:

    因为PHP的integer类型是有符号，并且有许多的IP地址讲导致在32位系统的情况下为负数，你需要使用"%u"进行转换通过sprintf()或printf()得到的字符串来表示无符号的IP地址。

    Note:

    ip2long()将返回FALSE在IP是255.255.255.255的情况，版本为 PHP 5 <= 5.0.2.在修复后 PHP 5.0.3 会返回-1(与PHP4相同).

    参见

    • long2ip() 将长整型转化为字符串形式带点的互联网标准格式地址（IPV4）
    • sprintf()Return a formatted string
    A quick method to convert a netmask (ex: 255.255.255.240) to a cidr mask (ex: /28):
<?php
function mask2cidr($mask){
 $long = ip2long($mask);
 $base = ip2long('255.255.255.255');
 return 32-log(($long ^ $base)+1,2);
 /* xor-ing will give you the inverse mask,
   log base 2 of that +1 will return the number
   of bits that are off in the mask and subtracting
   from 32 gets you the cidr notation */
    
}
?>

    <?php
/*
   Given an IP address and Subnet Mask, 
   determine the subnet address, broadcast address, and wildcard mask
   by using bitwise operators
   ref: http://php.net/manual/en/language.operators.bitwise.php
*/
$ip='10.10.10.7';
$mask='255.255.255.0';
$wcmask=long2ip( ~ip2long($mask) );
$subnet=long2ip( ip2long($ip) & ip2long($mask) );
$bcast=long2ip( ip2long($ip) | ip2long($wcmask) );
echo "Given address $ip and mask $mask, \n" . 
"the subnet is $subnet and broadcast is $bcast \n" . 
"with a wildcard mask of $wcmask";
/*
Given address 10.10.10.7 and mask 255.255.255.0, 
the subnet is 10.10.10.0 and broadcast is 10.10.10.255 
with a wildcard mask of 0.0.0.255
*/
?>

    The manual states that "ip2long() will also work with non-complete IP addresses", however this is system-dependant so cannot be relied upon. For example, on my system ip2long() will return FALSE for incomplete addresses:
<?php
var_dump(ip2long("255.255")); // bool(false)
?>
This is because ip2long will use inet_pton if available, which does not support non-complete addresses. If inet_pton is not available on your system, inet_addr will be used and incomplete addresses will work as stated.
    To nate, who advises that there is no reason to use an unsigned version of the IP in a MySQL DB:
I think it would depend on your application, but personally, I find it useful to store IP's as unsigneds since MySQL has 2 native functions, INET_ATON() and INET_NTOA(), which work the same as ip2long()/long2ip() _except_ that they generate the unsigned counterpart. So if you want, you could do:
-- IANA Class-B reserved/private
SELECT * FROM `servers` 
WHERE `ip` >= INET_ATON('192.168.0.0') 
AND `ip` <= INET_ATON('192.168.255.255');
In my current application, I find it easier to use the MySQL built-ins than the PHP counter-parts. 
In case you're curious as to the names ATON and NTOA:
ATON = address to number aka. ip2long
NTOA = number to address aka. long2ip
    Another function for matching $_SERVER['REMOTE_ADDR'] against CIDR.
<?php
function matchCIDR($addr, $cidr) {
  list($ip, $mask) = explode('/', $cidr);
  $mask = 0xffffffff << (32 - $mask);
  return ((ip2long($addr) & $mask) == (ip2long($ip) & $mask));
}
?>

    To get the network adress out of the broadcast adress and netmask just to an AND on it:
<?php
// simple example
$bcast = ip2long("192.168.178.255");
$smask = ip2long("255.255.255.0");
$nmask = $bcast & $smask;
echo long2ip($nmask); // Will give 192.168.178.0
?>
With this example you are able to check if a given host is in your own local net or not (on linux):
<?php
/**
 * Check if a client IP is in our Server subnet
 *
 * @param string $client_ip
 * @param string $server_ip
 * @return boolean
 */
function clientInSameSubnet($client_ip=false,$server_ip=false) {
  if (!$client_ip)
    $client_ip = $_SERVER['REMOTE_ADDR'];
  if (!$server_ip)
    $server_ip = $_SERVER['SERVER_ADDR'];
  // Extract broadcast and netmask from ifconfig
  if (!($p = popen("ifconfig","r"))) return false;
  $out = "";
  while(!feof($p))
    $out .= fread($p,1024);
  fclose($p);
  // This is because the php.net comment function does not
  // allow long lines.
  $match = "/^.*".$server_ip;
  $match .= ".*Bcast:(\d{1,3}\.\d{1,3}i\.\d{1,3}\.\d{1,3}).*";
  $match .= "Mask:(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})$/im";
  if (!preg_match($match,$out,$regs))
    return false;
  $bcast = ip2long($regs[1]);
  $smask = ip2long($regs[2]);
  $ipadr = ip2long($client_ip);
  $nmask = $bcast & $smask;
  return (($ipadr & $smask) == ($nmask & $smask));
}
?>

    Keep in mind that storing IP addresses inside of your database as integers (rather than 15 character strings in decimal format, or 8 character strings in hex format) is hundreds of times faster.
Take the typical case of a MySQL database doing a search for an IP address on thousands (or millions!) of rows; you're either doing a string compare for each entry, or an integer equation. If you do your indexes correctly, your lookups should be literally 100x faster using an INT rather than a VARCHAR.
Also note that an integer doesn't need to be escaped when passed to a database. :)
    The following function ipToHex will take an IP (v4 or v6 formatted) and if it is valid, will return a 32 byte hex string representing that address. Requires php >= 5.2 as it uses the filter_var function.
<?php
function ipToHex($ipAddress) {
  $hex = '';
  if(strpos($ipAddress, ',') !== false) {
    $splitIp = explode(',', $ipAddress);
    $ipAddress = trim($splitIp[0]);
  }
  $isIpV6 = false;
  $isIpV4 = false;
  if(filter_var($ipAddress, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6) !== false) {
    $isIpV6 = true;
  }
  else if(filter_var($ipAddress, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4) !== false) {
    $isIpV4 = true;
  }
  if(!$isIpV4 && !$isIpV6) {
    return false;
  }
  // IPv4 format
  if($isIpV4) {
    $parts = explode('.', $ipAddress);
    for($i = 0; $i < 4; $i++) {
      $parts[$i] = str_pad(dechex($parts[$i]), 2, '0', STR_PAD_LEFT);
    }
    $ipAddress = '::'.$parts[0].$parts[1].':'.$parts[2].$parts[3];
    $hex = join('', $parts);
  }
  // IPv6 format
  else {
    $parts = explode(':', $ipAddress);
    // If this is mixed IPv6/IPv4, convert end to IPv6 value
    if(filter_var($parts[count($parts) - 1], FILTER_VALIDATE_IP, FILTER_FLAG_IPV4) !== false) {
      $partsV4 = explode('.', $parts[count($parts) - 1]);
      for($i = 0; $i < 4; $i++) {
        $partsV4[$i] = str_pad(dechex($partsV4[$i]), 2, '0', STR_PAD_LEFT);
      }
      $parts[count($parts) - 1] = $partsV4[0].$partsV4[1];
      $parts[] = $partsV4[2].$partsV4[3];
    }
    $numMissing = 8 - count($parts);
    $expandedParts = array();
    $expansionDone = false;
    foreach($parts as $part) {
      if(!$expansionDone && $part == '') {
        for($i = 0; $i <= $numMissing; $i++) {
          $expandedParts[] = '0000';
        }
        $expansionDone = true;
      }
      else {
        $expandedParts[] = $part;
      }
    }
    foreach($expandedParts as &$part) {
      $part = str_pad($part, 4, '0', STR_PAD_LEFT);
    }
    $ipAddress = join(':', $expandedParts);
    $hex = join('', $expandedParts);
  }
  // Validate the final IP
  if(!filter_var($ipAddress, FILTER_VALIDATE_IP)) {
    return false;
  }
  return strtolower(str_pad($hex, 32, '0', STR_PAD_LEFT));
}
$ips = array(
  '::192.168.0.2',
  '0:0:0:0:0:0:192.168.0.2',
  '192.168.0.2',
  '::C0A8:2',
  '0:0:0:0:0:0:C0A8:2'
);
$finals = array();
foreach($ips as $ip) {
  $finals[] = ipToHex($ip);
}
var_dump($finals);
?>

    here is netMatch function which is the fastest I could wrote, I hope developers will include native function soon...
<?php
function netMatch ($CIDR,$IP) {
  list ($net, $mask) = explode ('/', $CIDR);
  return ( ip2long ($IP) & ~((1 << (32 - $mask)) - 1) ) == ip2long ($net);
}
?>

    Convert IP to unsigned long
<?php
//$strIP :  IP in String-format
//$lngIP :  IP in unsigned long
if (($lngIP=ip2long($strIP)) < 0){ $lngIP += 4294967296 ;}
                            // ADD 2^32
thats all.
?>

    Unfortunately sprintf('%u', ...) is low and returns string representation of integer value instead of integer.
Here is a function I use to convert IP to mySQL-compatible signed integer:
function ip2int($ip) {
 if (!$r = ip2long($ip)) return 0; // we want 0 instead of false, even in case of bad IP
 if ($r > 2147483647)
   $r-= 4294967296;
 return $r; // ok
}
    I've write an IPFilter class to check if a ip is in given ips.
<?php
class IPFilter
{
  private static $_IP_TYPE_SINGLE = 'single';
  private static $_IP_TYPE_WILDCARD = 'wildcard';
  private static $_IP_TYPE_MASK = 'mask';
  private static $_IP_TYPE_SECTION = 'section';
  private $_allowed_ips = array();
  public function __construct($allowed_ips)
  {
    $this -> _allowed_ips = $allowed_ips;
  }
  public function check($ip, $allowed_ips = null)
  {
    $allowed_ips = $allowed_ips ? $allowed_ips : $this->_allowed_ips;
    foreach($allowed_ips as $allowed_ip)
    {
      $type = $this -> _judge_ip_type($allowed_ip);
      $sub_rst = call_user_func(array($this,'_sub_checker_' . $type), $allowed_ip, $ip);
      if ($sub_rst)
      {
        return true;
      }
    }
    return false;
  }
  private function _judge_ip_type($ip)
  {
    if (strpos($ip, '*'))
    {
      return self :: $_IP_TYPE_WILDCARD;
    }
    if (strpos($ip, '/'))
    {
      return self :: $_IP_TYPE_MASK;
    }
    if (strpos($ip, '-'))
    {
      return self :: $_IP_TYPE_SECTION;
    }
    if (ip2long($ip))
    {
      return self :: $_IP_TYPE_SINGLE;
    }
    return false;
  }
  private function _sub_checker_single($allowed_ip, $ip)
  {
    return (ip2long($allowed_ip) == ip2long($ip));
  }
  private function _sub_checker_wildcard($allowed_ip, $ip)
  {
    $allowed_ip_arr = explode('.', $allowed_ip);
    $ip_arr = explode('.', $ip);
    for($i = 0;$i < count($allowed_ip_arr);$i++)
    {
      if ($allowed_ip_arr[$i] == '*')
      {
        return true;
      }
      else
      {
        if (false == ($allowed_ip_arr[$i] == $ip_arr[$i]))
        {
          return false;
        }
      }
    }
  }
  private function _sub_checker_mask($allowed_ip, $ip)
  {
    list($allowed_ip_ip, $allowed_ip_mask) = explode('/', $allowed_ip);
    $begin = (ip2long($allowed_ip_ip) &ip2long($allowed_ip_mask)) + 1;
    $end = (ip2long($allowed_ip_ip) | (~ip2long($allowed_ip_mask))) + 1;
    $ip = ip2long($ip);
    return ($ip >= $begin && $ip <= $end);
  }
  private function _sub_checker_section($allowed_ip, $ip)
  {
    list($begin, $end) = explode('-', $allowed_ip);
    $begin = ip2long($begin);
    $end = ip2long($end);
    $ip = ip2long($ip);
    return ($ip >= $begin && $ip <= $end);
  }
}
?>
useage:
<?php
$filter = new IPFilter(
  array(
    '127.0.0.1',
    '172.0.0.*',
    '173.0.*.*',
    '126.1.0.0/255.255.0.0',
    '125.0.0.1-125.0.0.9',
));
$filter -> check('126.1.0.2');
?>

    Hi,
based on examples above I have mixed class IPFilter with netMatch function wich gives me complete class for IP4 check including CIDR IP format:
<?php
class IP4Filter {
  private static $_IP_TYPE_SINGLE = 'single';
  private static $_IP_TYPE_WILDCARD = 'wildcard';
  private static $_IP_TYPE_MASK = 'mask';
  private static $_IP_TYPE_CIDR = 'CIDR';
  private static $_IP_TYPE_SECTION = 'section';
  private $_allowed_ips = array();
  public function __construct($allowed_ips) {
    $this->_allowed_ips = $allowed_ips;
  }
  public function check($ip, $allowed_ips = null) {
    $allowed_ips = $allowed_ips ? $allowed_ips : $this->_allowed_ips;
    foreach ($allowed_ips as $allowed_ip) {
      $type = $this->_judge_ip_type($allowed_ip);
      $sub_rst = call_user_func(array($this, '_sub_checker_' . $type), $allowed_ip, $ip);
      if ($sub_rst) {
        return true;
      }
    }
    return false;
  }
  private function _judge_ip_type($ip) {
    if (strpos($ip, '*')) {
      return self :: $_IP_TYPE_WILDCARD;
    }
    if (strpos($ip, '/')) {
      $tmp = explode('/', $ip);
      if (strpos($tmp[1], '.')) {
        return self :: $_IP_TYPE_MASK;
      } else {
        return self :: $_IP_TYPE_CIDR;
      }
    }
    if (strpos($ip, '-')) {
      return self :: $_IP_TYPE_SECTION;
    }
    if (ip2long($ip)) {
      return self :: $_IP_TYPE_SINGLE;
    }
    return false;
  }
  private function _sub_checker_single($allowed_ip, $ip) {
    return (ip2long($allowed_ip) == ip2long($ip));
  }
  private function _sub_checker_wildcard($allowed_ip, $ip) {
    $allowed_ip_arr = explode('.', $allowed_ip);
    $ip_arr = explode('.', $ip);
    for ($i = 0; $i < count($allowed_ip_arr); $i++) {
      if ($allowed_ip_arr[$i] == '*') {
        return true;
      } else {
        if (false == ($allowed_ip_arr[$i] == $ip_arr[$i])) {
          return false;
        }
      }
    }
  }
  private function _sub_checker_mask($allowed_ip, $ip) {
    list($allowed_ip_ip, $allowed_ip_mask) = explode('/', $allowed_ip);
    $begin = (ip2long($allowed_ip_ip) & ip2long($allowed_ip_mask)) + 1;
    $end = (ip2long($allowed_ip_ip) | (~ ip2long($allowed_ip_mask))) + 1;
    $ip = ip2long($ip);
    return ($ip >= $begin && $ip <= $end);
  }
  private function _sub_checker_section($allowed_ip, $ip) {
    list($begin, $end) = explode('-', $allowed_ip);
    $begin = ip2long($begin);
    $end = ip2long($end);
    $ip = ip2long($ip);
    return ($ip >= $begin && $ip <= $end);
  }
  private function _sub_checker_CIDR($CIDR, $IP) {
    list ($net, $mask) = explode('/', $CIDR);
    return ( ip2long($IP) & ~((1 << (32 - $mask)) - 1) ) == ip2long($net);
  }
}
?>
For me this code works great, so I wanna thank to all You guys!!!
    I would just like to try and clear up simply that if storing IPV4 addresses in an SQL database you should use an unsigned int (4 bytes).
The easiest way to do this in PHP is to use sprintf():
<?php
 $dottedFormatAddress = '127.0.0.1';
 $ipv4address = sprintf("%u", ip2long($dottedFormatAddress));
?>
Primary reasons are it's compatible with database functions like MySQL's INET_ATON & INET_NTOA (which also use unsigned int's), it's efficient, and it's the most common format used by IP lookup databases.
    <?php
function CalculateIPRange($iprange)
{
  // Daevid Vincent [daevid@daevid.com] 10.13.03
  // This function will return an array of either a negative error code 
  // or all possible IP addresses in the given range.
  // format is NNN.NNN.NNN.NNN - NNN.NNN.NNN.NNN (spaces are okay)
  $temp = preg_split("/-/",$iprange, -1, PREG_SPLIT_NO_EMPTY);
  $QRange1 = $temp[0];
  $QRange2 = $temp[1];
  if ($QRange2 == "") return array($QRange1); //special case, they didn't put a second quad parameter
  //basic error handling to see if it is generally a valid IP in the form N.N.N.N
  if ( preg_match("/\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}/",$QRange1) != 1 ) return array(-1);
  if ( preg_match("/\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}/",$QRange2) != 1 ) return array(-1);
  $quad1 = explode(".",$QRange1);
  $quad2 = explode(".",$QRange2);
  reset ($quad1);
  while (list ($key, $val) = each ($quad1))
  {
     $quad1[$key] = intval($val);
     if ($quad1[$key] < 0 || $quad1[$key] > 255) return array(-2);
  }
  reset ($quad2);
  while (list ($key, $val) = each ($quad2))
  {
     $quad2[$key] = intval($val);
     if ($quad2[$key] < 0 || $quad2[$key] > 255) return array(-2);
  }
  $startIP_long = sprintf("%u",ip2long($QRange1));
  $endIP_long = sprintf("%u",ip2long($QRange2));
  $difference = $endIP_long - $startIP_long;
  //echo "startIP_long = ".$startIP_long." and endIP_long = ".$endIP_long." difference = ".$difference."<BR>";
  $ip = array(); 
  $k = 0;
  for ($i = $startIP_long; $i <= $endIP_long; $i++)
  {
    $temp = long2ip($i);
    
    //this is a total hack. there must be a better way.
    $thisQuad = explode(".",$temp);
    if ($thisQuad[3] > 0 && $thisQuad[3] < 255)
      $ip[$k++] = $temp;
  }
  return $ip;
} //CalculateIPRange()
?>

    Here's a function I whipped up today to deduce some important network information given a hostname (or its IP address) and its subnet mask:
<?php
function find_net($host,$mask) {
  ### Function to determine network characteristics
  ### $host = IP address or hostname of target host (string)
  ### $mask = Subnet mask of host in dotted decimal (string)
  ### returns array with
  ###  "cidr"   => host and mask in CIDR notation
  ###  "network"  => network address
  ###  "broadcast" => broadcast address
  ###
  ### Example: find_net("192.168.37.215","255.255.255.224")
  ### returns:
  ###  "cidr"   => 192.168.37.215/27
  ###  "network"  => 192.168.37.192
  ###  "broadcast" => 192.168.37.223
  ###
  $bits=strpos(decbin(ip2long($mask)),"0");
  $net["cidr"]=gethostbyname($host)."/".$bits;
  $net["network"]=long2ip(bindec(decbin(ip2long(gethostbyname($host))) & decbin(ip2long($mask))));
  $binhost=str_pad(decbin(ip2long(gethostbyname($host))),32,"0",STR_PAD_LEFT);
  $binmask=str_pad(decbin(ip2long($mask)),32,"0",STR_PAD_LEFT);
  for ($i=0; $i<32; $i++) {
   if (substr($binhost,$i,1)=="1" || substr($binmask,$i,1)=="0") {
     $broadcast.="1";
   } else {
     $broadcast.="0";
   }
  }
  $net["broadcast"]=long2ip(bindec($broadcast));
  return $net;
}
?>

    In 32bits systems, you cannot convert ipv6 to long, but you can convert ip2bin and bin2ip
This function converts ipv4 and ipv6, returns false if ip is not valid
<?php
function ip2bin($ip)
{
  if(filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4) !== false)
    return base_convert(ip2long($ip),10,2);
  if(filter_var($ip, FILTER_VALIDATE_IP, FILTER_FLAG_IPV6) === false)
    return false;
  if(($ip_n = inet_pton($ip)) === false) return false;
  $bits = 15; // 16 x 8 bit = 128bit (ipv6)
  while ($bits >= 0)
  {
    $bin = sprintf("%08b",(ord($ip_n[$bits])));
    $ipbin = $bin.$ipbin;
    $bits--;
  }
  return $ipbin;
}
function bin2ip($bin)
{
  if(strlen($bin) <= 32) // 32bits (ipv4)
    return long2ip(base_convert($bin,2,10));
  if(strlen($bin) != 128)
    return false;
  $pad = 128 - strlen($bin);
  for ($i = 1; $i <= $pad; $i++)
  {
    $bin = "0".$bin;
  }
  $bits = 0;
  while ($bits <= 7)
  {
    $bin_part = substr($bin,($bits*16),16);
    $ipv6 .= dechex(bindec($bin_part)).":";
    $bits++;
  }
  return inet_ntop(inet_pton(substr($ipv6,0,-1)));
}
?>

    If you want to validate IPs using this function, please be careful:
The function filter_var should be used instead for validating IPs.
<?php
$ip = '192.168.0355.24';
var_dump(ip2long($ip) !== false); // true (expected false)
var_dump(filter_var($ip, FILTER_VALIDATE_IP) !== false); // false
$ip = '192.168.355.24';
var_dump(ip2long($ip) !== false); // false
var_dump(filter_var($ip, FILTER_VALIDATE_IP) !== false); // false
?>

    Universal ip4/ip6
<?php
// encoded --
function encode_ip ($ip)
{
  $d = explode('.', $ip);
  if (count($d) == 4) return sprintf('%02x%02x%02x%02x', $d[0], $d[1], $d[2], $d[3]);
 
  $d = explode(':', preg_replace('/(^:)|(:$)/', '', $ip));
  $res = '';
  foreach ($d as $x)
    $res .= sprintf('%0'. ($x == '' ? (9 - count($d)) * 4 : 4) .'s', $x);
  return $res;
}
// decoded
function decode_ip($int_ip)
{
  function hexhex($value) { return dechex(hexdec($value)); };
 
  if (strlen($int_ip) == 32) {
    $int_ip = substr(chunk_split($int_ip, 4, ':'), 0, 39);
    $int_ip = ':'. implode(':', array_map("hexhex", explode(':',$int_ip))) .':';
    preg_match_all("/(:0)+/", $int_ip, $zeros);
    if (count($zeros[0]) > 0) {
      $match = '';
      foreach($zeros[0] as $zero)
        if (strlen($zero) > strlen($match))
          $match = $zero;
      $int_ip = preg_replace('/'. $match .'/', ':', $int_ip, 1);
    }
    return preg_replace('/(^:([^:]))|(([^:]):$)/', '$2$4', $int_ip);
  }
  $hexipbang = explode('.', chunk_split($int_ip, 2, '.'));
  return hexdec($hexipbang[0]). '.' . hexdec($hexipbang[1]) . '.' . hexdec($hexipbang[2]) . '.' . hexdec($hexipbang[3]);
}
?>
DB:
`user_ip` varchar(32) DEFAULT NULL
    <?php
/**
 *
 *get the first ip and last ip from cidr(network id and mask length)
 * i will integrate this function into "Rong Framework" :)
 * @author admin@wudimei.com
 * @param string $cidr 56.15.0.6/16 , [network id]/[mask length]
 * @return array $ipArray = array( 0 =>"first ip of the network", 1=>"last ip of the network" );
 *             Each element of $ipArray's type is long int,use long2ip( $ipArray[0] ) to convert it into ip string.
 * example:
 * list( $long_startIp , $long_endIp) = getIpRange( "56.15.0.6/16" );
 * echo "start ip:" . long2ip( $long_startIp );
 * echo "<br />";
 * echo "end ip:" . long2ip( $long_endIp );
 */
 function getIpRang( $cidr) {
  list($ip, $mask) = explode('/', $cidr);
 
  $maskBinStr =str_repeat("1", $mask ) . str_repeat("0", 32-$mask );   //net mask binary string
  $inverseMaskBinStr = str_repeat("0", $mask ) . str_repeat("1", 32-$mask ); //inverse mask
  
  $ipLong = ip2long( $ip );
  $ipMaskLong = bindec( $maskBinStr );
  $inverseIpMaskLong = bindec( $inverseMaskBinStr );
  $netWork = $ipLong & $ipMaskLong; 
  $start = $netWork+1;//去掉网络号 ,ignore network ID(eg: 192.168.1.0)
 
  $end = ($netWork | $inverseIpMaskLong) -1 ; //去掉广播地址 ignore brocast IP(eg: 192.168.1.255)
  return array( $start, $end );
}
?>

    to Anonymous @ 29-Aug-2008 10:19
If you're speaking about efficiency, there's no absolute right / wrong as it all depends on the user's needs, specs and requirements. 
But from what I'm coming from , this method served me well, I've used this to match 2 network ends of approx 2700++ something unique VRFs (Nortel Shasta) and yes, each VRF is a virtualized firewall that consists of at least 20 different network objects (some could have couple of hundreds). Not to mention that these , still have to be compared with another hundreds of contivity boxes and each box have a range of around 1-600 vpn peers (to add more complexity, each peer has around 1-50 network ranges). 
So, if you do the math, the number of permutations that need to be calculated, is indeed quite complex. I could get the whole result somewhere in around 50-65 secs tops. 
Had I used a php function to crunch those data the result would have been longer.
    NOTE: ip2long() should NOT be used for CIDR calculation. 
Instead, you should use something like the following:
<?php
    /* get the base and the bits from the ban in the database */
    list($base, $bits) = explode('/', $CIDR);
    /* now split it up into it's classes */
    list($a, $b, $c, $d) = explode('.', $base);
    /* now do some bit shfiting/switching to convert to ints */
    $i = ($a << 24) + ($b << 16) + ($c << 8) + $d;
    $mask = $bits == 0 ? 0 : (~0 << (32 - $bits));
    /* here's our lowest int */
    $low = $i & $mask;
    /* here's our highest int */
    $high = $i | (~$mask & 0xFFFFFFFF);
    /* now split the ip were checking against up into classes */
    list($a, $b, $c, $d) = explode('.', $iptocheck);
    /* now convert the ip we're checking against to an int */
    $check = ($a << 24) + ($b << 16) + ($c << 8) + $d;
    /* if the ip is within the range, including 
   highest/lowest values, then it's witin the CIDR range */
    if ($check >= $low && $check <= $high)
      return 1;
    else
      return 0;
?>
This means that you should check to see if the IP
address is of the correct format each time.
    Here is a modified version of the code posted by legetz81 (AT) yahoo (dot) com. It handles the shorter, and more common, notation: "189.128/11".
<?php
$ip_addr_cidr = "192.168.37.215/27";
cidr($ip_addr_cidr);
function cidr($ip_addr_cidr) {
$ip_arr = explode('/', $ip_addr_cidr);
$dotcount = substr_count($ip_arr[0], ".");
$padding = str_repeat(".0", 3 - $dotcount);
$ip_arr[0].=$padding;
$bin = '';
for($i=1;$i<=32;$i++) {
  $bin .= $ip_arr[1] >= $i ? '1' : '0';
}
$ip_arr[1] = bindec($bin);
$ip = ip2long($ip_arr[0]);
$nm = ip2long($ip_arr[1]);
$nw = ($ip & $nm);
$bc = $nw | (~$nm);
echo "Number of Hosts:  " . ($bc - $nw - 1) . "\n";
echo "Host Range:    " . long2ip($nw + 1) . " -> " . long2ip($bc - 1) . "\n";
/*
This will produce:
Number of Hosts:  30
Host Range:    192.168.37.193 -> 192.168.37.222
*/
}
?>

    I wanted to build on what kaputt and spinyn contributed in a way that I think is a little more intuitive (e.g., let sprintf do all the binary conversion and padding, and let substr_compare do the trimming and comparing):
<?php
function ip_in_network($ip, $net_addr, $net_mask){
  if($net_mask <= 0){ return false; }
    $ip_binary_string = sprintf("%032b",ip2long($ip));
    $net_binary_string = sprintf("%032b",ip2long($net_addr));
    return (substr_compare($ip_binary_string,$net_binary_string,0,$net_mask) === 0);
}
ip_in_network("192.168.2.1","192.168.2.0",24); //true
ip_in_network("192.168.6.93","192.168.0.0",16); //true
ip_in_network("1.6.6.6","128.168.2.0",1); //false
?>

    Be aware when you're running 64bit system, ip2long will result 64 bit integer which doesn't fit in MySQL INT, you can use BIGINT or INT UNSIGNED because on 64bit systems ip2long will never return negative integer. See also https://bugs.php.net/bug.php?id=54338
    As pointed out by others, this function's return value is not consistent on 32 and 64-bit platforms.
Your best bet for consistent behavior across 32/64-bit platforms (and Windows) is the lowest common denominator: force the return value of ip2long() into a signed 32-bit integer, e.g.:
  var_dump(unpack('l', pack('l', ip2long('255.255.255.0'))));
This looks idiotic, but it gives you a consistent signed integer value on all platforms.
(the arguments to both pack() and unpack() are the lower-case letter "L", not the number "1", in case it looks that way on your screen...)
    The following script will print out subnet statistics when you supply the IP Address and Subnet Mask. Usefull to calculate the broadcast address and network address as well as the number of hosts and the range of IP addresses in the subnet.
#!/usr/local/bin/php
<?php
  $ip_addr = "172.14.1.57";
  $subnet_mask = "255.255.255.0";
  $ip = ip2long($ip_addr);
  $nm = ip2long($subnet_mask);
  $nw = ($ip & $nm);
  $bc = $nw | (~$nm);
  echo "IP Address:     " . long2ip($ip) . "\n";
  echo "Subnet Mask:    " . long2ip($nm) . "\n";
  echo "Network Address:  " . long2ip($nw) . "\n";
  echo "Broadcast Address: " . long2ip($bc) . "\n";
  echo "Number of Hosts:  " . ($bc - $nw - 1) . "\n";
  echo "Host Range:     " . long2ip($nw + 1) . " -> " . long2ip($bc - 1) . "\n";
?>
Produces the output:
IP Address:     172.14.1.57
Subnet Mask:    255.255.255.0
Network Address:  172.14.1.0
Broadcast Address: 172.14.1.255
Number of Hosts:  254
Host Range:     172.14.1.1 -> 172.14.1.254
    To always get the signed 32bit representation of an ip, I found this workaround:
<?php
list(, $ip) = unpack('l',pack('l',ip2long('200.200.200.200')));
?>
In this example, $ip will be -926365496 regardless of a 32 or 64 bit system.
    Here some working ip2long6 and long2ip6 functions - keep in mind that this needs php gmp-lib:
<?php
$ipv6 = "2001:4860:a005::68";
function ip2long6($ipv6) {
 $ip_n = inet_pton($ipv6);
 $bits = 15; // 16 x 8 bit = 128bit
 while ($bits >= 0) {
  $bin = sprintf("%08b",(ord($ip_n[$bits])));
  $ipv6long = $bin.$ipv6long;
  $bits--;
 }
 return gmp_strval(gmp_init($ipv6long,2),10);
}
function long2ip6($ipv6long) {
 $bin = gmp_strval(gmp_init($ipv6long,10),2);
 if (strlen($bin) < 128) {
  $pad = 128 - strlen($bin);
  for ($i = 1; $i <= $pad; $i++) {
  $bin = "0".$bin;
  }
 }
 $bits = 0;
 while ($bits <= 7) {
  $bin_part = substr($bin,($bits*16),16);
  $ipv6 .= dechex(bindec($bin_part)).":";
  $bits++;
 }
 // compress
 return inet_ntop(inet_pton(substr($ipv6,0,-1)));
}
print $ipv6long = ip2long6($ipv6)."\n";
print $ipv6 = long2ip6($ipv6long)."\n";
?>
outputs:
42541956150894553250710573749450571880
2001:4860:a005::68
    I wrote something on the different ways to get an IP and convert it using ip2long(), the different ways to store an IP or an IP range in MySQL, and the different ways to query for the IP(s). Maybe something useful for others?
http://strictcoder.blogspot.com/2009_08_01_archive.html
Title: Query For An IP In A Database
Regards,
Joshua K Roberson
    Just want to add a comment to kaputt's valuable contribution to the task of matching hosts to ip ranges, efficiently. The script works fine if the binary representation of the ip involves no leading zeros. Unfortunately, the way decbin() seems to work, leading zeros in the binary representation of the first ip quad get dropped. That is a serious matter if you're trying to match all possible candidates in the checklist. In those cases the leading zeros need to be added back to get accurate matches for values in the first quad between 0-127 (or the binary equivalent, 0-01111111).
The solution I came up with to address this issue was the following function:
<?php
function addLeadingZero($ip) {
  if (($result = (32 - strlen($ip))) > 0)
   return str_repeat("0", $result).$ip;
}
?>

    Hi,
Please find below a little function I wrote for handling IP addresses as unsigned integers.
This function will take an IP address or IP number in ANY FORMAT (that I can think of) and will return it's decimal unsigned equivalent, as a string.
<?php
function myip2long($ip){
  if (is_numeric($ip)){
    return sprintf("%u", floatval($ip));
  } else {
    return sprintf("%u", floatval(ip2long($ip)));
  }
}
?>
Here is is in action:
<?php
$ip['DottedQuadDec'] = "192.168.255.109";
$ip['PosIntStr']   = "3232300909";
$ip['NegIntStr']   = "-1062666387";
$ip['PosInt']    = 3232300909;
$ip['NegInt']    = -1062666387;
$ip['DottedQuadHex'] = "0xc0.0xA8.0xFF.0x6D";
$ip['DottedQuadOct'] = "0300.0250.0377.0155";
$ip['HexIntStr']   = "0xC0A8FF6D";
$ip['HexInt']    = 0xC0A8FF6D;
printf("\n% 16s : % 20s => % 11s => % 16s","Input Type","Input Value","Converted","Converted Back");
echo "\n  ------------------------------------------------------------------";
foreach ($ip as $type => $value){
  $ipnum = myip2long($value);
  printf("\n% 16s : % 20s => % 11s => % 16s",$type,$value,$ipnum,long2ip($ipnum));
}
?>

    I had a problem with calling this function with REMOTE_ADDR on my lighttpd web server. Turned out that IPv6 was installed on this server, so even though REMOTE_ADDR was an IPv4 address, it was being formatted using IPv6's IPv4 compatibility mode. For example, 10.0.0.1 was becoming ::ffff:10.0.0.1, which caused iplong to report the address as invalid instead of parsing it correctly.
The correct fix would of course be to update my infrastructure so that it's properly IPv6-compatible; but in the context of my particular situation, this would involve a lot of re-engineering. So in the meantime, I worked around the issue using this quick and dirty hack:
<?php
  $ip = htmlspecialchars($_SERVER['REMOTE_ADDR']);
  if (strpos($ip, '::') === 0) {
    $ip = substr($ip, strrpos($ip, ':')+1);
  }
  $host = ip2long($ip);
?>
Ugly but functional.
    In using a combination of jbothe's code below and some of the "$mask = 0xFFFFFFFF << (32 - $bits)" type code, I ran into an error with some later calculations on a 64 bit machine.
Keep in mind that when you're analyzing numbers meant to be treated as 32 bits wide (such as IP addresses), you may want to truncate them. Without relying on other libraries, it was simple enough to follow any calculations that may end with different results on a 64 bit machine with " & 0xFFFFFFFF"
Though in many cases, it seems like it might be simpler to just use "~0 << ..." for initial shifting to create the network mask instead of "0xFFFFFFFF << ...". I don't know that it guarantees further operations to work as expected though.
    @ samb057 at gmail dot com
This function will not return a correct bigint.
base_convert() is limited to the double type,
which usually counts 64bits and not 128 like an IPv6 address.
For example:
FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF:FFFF
will __NOT__ be converted to 128^2 -1
You should use a bigint lib's multiplication function,
with decimal shifting factors defined as string constants (much faster than recalculating them every time).
Grab 8 short integers (the 16bits between the ':' with base_convert($hex,16,10)) and shift the 7 higher ones with a bigint_multiplication.
Of course you can also do it with less bigint ops using 32bit integers, but then you should create them this way (additionally 'sprintf' for making an uint32 string):
$uint32= sprintf('%u',intval(base_convert($hex,16,10)));
Finally, "bigint_add" the shifted ones to the least (unshifted) significant interger string and be happy
PS: I'm working on an IPv4/6 tool class with raw (also endianness), 6/4 compatibility and validation methods,
I'll post it here as soon as it's finished and tested.
    A somewhat more efficient alternative to convert the signed integer return by ip2long:
$float = ((ip2long($ip) & 0x7FFFFFFF) + 0x80000000);
    I wrote a small function to validate a netmask (We have a form where the netmask of a given server is entered in, and I wanted to make sure it was valid). Hope this is useful.
<?php
// Netmask Validator //
function checkNetmask($ip) {
 if (!ip2long($ip)) {
 return false;
 } elseif(strlen(decbin(ip2long($ip))) != 32 && ip2long($ip) != 0) {
 return false;
 } elseif(ereg('01',decbin(ip2long($ip))) || !ereg('0',decbin(ip2long($ip)))) {
 return false;
 } else {
 return true;
 }
}
?>

    Here's a simple IP address match checking function.
It takes 3 arguments: ip address to check (after ip2long), ip address to check against (after ip2long), and mask to check against (integer 0-32).
Just make sure you perform ip2long on the ip addresses before inputting them to the function.
<?php
function match_ip($check_ip, $match_ip, $match_mask = 32)
  {
    for ($i = 0 ; $i < $match_mask ; $i++)
      {
        $n = pow(2, 31 - $i) ;
        if (($n & $check_ip) != ($n & $match_ip))
          {
            return FALSE ;
          }
      }
      
    return TRUE ;
  }
?>
I've been looking for a function like this for a while, i hope it helps someone.
    Below is a merged form of all various notes, and a better (and correct) network matching function.
<?php
function net_match($network, $ip) {
   // determines if a network in the form of 192.168.17.1/16 or
   // 127.0.0.1/255.255.255.255 or 10.0.0.1 matches a given ip
   $ip_arr = explode('/', $network);
   $network_long = ip2long($ip_arr[0]);
   $x = ip2long($ip_arr[1]);
   $mask = long2ip($x) == $ip_arr[1] ? $x : 0xffffffff << (32 - $ip_arr[1]);
   $ip_long = ip2long($ip);
   // echo ">".$ip_arr[1]."> ".decbin($mask)."\n";
   return ($ip_long & $mask) == ($network_long & $mask);
}
echo net_match('192.168.17.1/16', '192.168.15.1')."\n"; // returns true
echo net_match('127.0.0.1/255.255.255.255', '127.0.0.2')."\n"; // returns false
echo net_match('10.0.0.1', '10.0.0.1')."\n"; // returns true
?>

    a little function to make a range in this form:
0.0.0.1/0.0.0.255     ==> 0.0.0.1/255
0.0.0.1/255.255.255.255  ==> 0.0.0.1/255.255.255.255
<?php
$primo = "62.4.32.0";
$ultimo = "62.4.63.255";
echo do_range($primo,$ultimo); //Example
function do_range($primo,$ultimo) {
list($a,$b,$c,$d)=explode(".",$primo);
list($e,$f,$g,$h)=explode(".",$ultimo);
if ($a !== $e) return "$primo/$ultimo";
else {
  if ($b !== $f) return "$primo/$f.$g.$h";
  else{
    if ($c !== $g) return "$primo/$g.$h";
    else {
      if ($d !== $h) return "$primo/$h";
      else return -1; //error
      }
    }
  }
}
?>
Please write me if you have any suggestion
    I re-wrote the functions from jbothe at hotmail dot com as a little exercise in OO and added a couple of extra functions.
<?php
 //--------------
// IPv4 class
class ipv4
{
 var $address;
 var $netbits;
  //--------------
 // Create new class
 function ipv4($address,$netbits)
 {
  $this->address = $address;
  $this->netbits = $netbits;
 }
  //--------------
 // Return the IP address
 function address() { return ($this->address); }
  //--------------
 // Return the netbits
 function netbits() { return ($this->netbits); }
  //--------------
 // Return the netmask
 function netmask()
 {
  return (long2ip(ip2long("255.255.255.255")
      << (32-$this->netbits)));
 }
  //--------------
 // Return the network that the address sits in
 function network()
 {
  return (long2ip((ip2long($this->address))
      & (ip2long($this->netmask()))));
 }
  //--------------
 // Return the broadcast that the address sits in
 function broadcast()
 {
  return (long2ip(ip2long($this->network())
      | (~(ip2long($this->netmask())))));
 }
  //--------------
 // Return the inverse mask of the netmask
 function inverse()
 {
  return (long2ip(~(ip2long("255.255.255.255")
      << (32-$this->netbits))));
 }
}
 $ip = new ipv4("192.168.2.1",24);
 print "Address: $ip->address()\n";
 print "Netbits: $ip->netbits()\n";
 print "Netmask: $ip->netmask()\n";
 print "Inverse: $ip->inverse()\n";
 print "Network: $ip->network()\n";
 print "Broadcast: $ip->broadcast()\n";
?>

    Here are my versions of prefix to mask and mask to prefix conversions. You can remove first lines with if/preg of each function if you don't want sanity precheck.
  function prefix2Mask($prefix)
  {
    if (!preg_match('#^(?:0*[0-2]?[0-9]|3[0-2])$#', $prefix)) return false; # wrong prefix
    return long2ip(0xffffffff << (32 - $prefix));
  }
  
  function mask2Prefix($mask)
  {
    if (!preg_match('#^(?:(?:[0-1][0-9][0-9]|2[0-4][0-9]|25[0-5]|[0-9][0-9]|[0-9])\.){3}'.
      '(?:[0-1][0-9][0-9]|2[0-4][0-9]|25[0-5]|[0-9][0-9]|[0-9])$#', $mask))
      return false; # wrong mask
    $m2p = str_pad(substr(decbin(ip2long($mask)), -32, 32), 32, '0', STR_PAD_LEFT);
    if (!preg_match('#^(1*)0*$#', $m2p, $m)) return false; # wrong mask
    return strlen($m[1]);
  }
    Just to save you some time.
Beware that octets in IP address are being treated as numbers. So, '10.0.0.11' is not equal to '10.0.0.011'. '011' is octal number (base 8), so it converts to '9'. You can even go further and see that '10.0.0.0xa' also works (equals to '10.0.0.16'). 
This is not PHP issue, though.
    sorry i just wrote wrong, sorry. this is the right one. thanks.
/**
 * convert cidr to ip range
 * From: <https://github.com/www-schat-top>
 * @param string $cidr "192.168.0.0/23"
 * @return array ["192.168.0.0", "192.168.1.255"]
 */
function cidr2range($cidr){
  list( $subnet, $mask ) = explode( '/', $cidr );
  return [$subnet, long2ip(ip2long( $subnet ) | (pow(2,( 32 - $mask ))-1))];
}
    If you want to get the interface of an IP, based on the local route table, use this.
<?php
function GetIfaceforIP($user_ip)
{
  $route = "/bin/netstat -rn";
  exec($route, $aoutput);
  foreach($aoutput as $key => $line)
  {
    if($key > 1)
    {
      $line = ereg_replace("[[:space:]]+",",",$line);
      list($network, $gateway, $mask, $flags, $mss, $window, $irtt, $iface) = explode(",", $line)
      if((ip2long($user_ip) & ip2long($mask)) == ip2long($network))
      {
        return $iface;
      }
    }
  }
}
?>

    @Teguh Iskanto
Hi,
Your solution requires you to store the IP addresses and masks as strings, and also to store the subnet mask being used by your hosts. This is very inefficient.
If you stored your network addresses as unsigned Integers, and your masks as TinyInts (i.e. a value between 0 & 32), you could instead do this:
select * from networks WHERE inet_aton('10.20.251.130') between `ipnumber` AND (`ipnumber` + (POW(2,(32-`mask`)))-1);
Obviously this can be made quicker on very high load systems by storing the broadcast address in the table instead of calculating it on the fly:
select * from networks WHERE inet_aton('10.20.251.130') between `ipnumber` AND `broadcast`;
Nick

    上篇：inet_pton()

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