PHP类ipinfo.class.php，支持64位

ipinfo.class.php

<?php
/*
* Leon
* http://nerrsoft.com
* leon@nerrsoft.com
* 2011-04-11
*/
class ipInfo{
    
    var $address;
    var $netbits;
  
    public function getIpInfo($ipStr){
        list($this->address, $this->netbits) = explode('/', $ipStr);

        $info['long']['mask'] = $this->netmask();   
        $info['ip']['mask'] = long2ip($info['long']['mask']);

        $info['long']['net'] = $this->network(); 
        $info['ip']['net'] = long2ip($info['long']['net']);

        $info['long']['begin'] = $info['long']['net'] + 1;
        $info['ip']['begin'] = long2ip($info['long']['begin']);

        $info['long']['end'] = abs($info['long']['mask']) + $info['long']['begin'] - 3;
        $info['ip']['end'] = long2ip($info['long']['end']);

        $info['long']['broacast'] = $this->broadcast();
        $info['ip']['broacast'] = long2ip($info['long']['broacast']);

        $info['count'] = $info['long']['broacast'] - $info['long']['net'] - 1;
           
        return $info;   
    }

    // Return the netmask
    function netmask(){
        $mask = $this->check6432('255.255.255.255');
        return $mask << (32 - $this->netbits);
    }

    // Return the network that the address sits in
    function network(){
        $ip = $this->check6432($this->address);
        return ($ip & $this->netmask());
    }

    // Return the broadcast that the address sits in
    function broadcast(){
        return ($this->network() | (~$this->netmask()));
    }

    // Return the inverse mask of the netmask
    function inverse(){
        $mask = $this->check6432('255.255.255.255');
        return (long2ip(~($mask << (32 - $this->netbits))));
    }

    //
    function check6432($ip){
        if(PHP_INT_MAX==2147483647){
          $mask = ip2long($ip);   
        }else{
          list(, $mask) = unpack('l', pack('l', ip2long($ip)));
        }
        return $mask;      
    }
}
?>