IP地址转换为十进制,反之亦然

Question

假设我的十进制数是9766322441如此相应,70.30.65.9但是当这个IP地址IC转换回来时,它会给出一些不同的十进制数1176387849......当我转换IP地址时,请将gof.com转换为ie,64.233.187.99然后它给出了1089059683反向转换,给出了正确的IP地址即64.233.187.99......

我的问题是上面提到的数字有什么问题？我也尝试9579342332但结果相同.它给出了错误的反向转换??

它背后的原因是什么？

您可以使用此计算器进行计算.

Answer 1

您有不正确的值70.30.65.9将对应1176387849但从不与9766322441对应.

限制32位 - Java:如何将dec转换为32位int？

C++将IP转换为十进制的示例:

#include <iostream.h>

main()
{
    // Initialize the variables
    unsigned long a,b,c,d,base10IP;

    // Get the IP address from user
    cout << "\nEnter an IP address in dotted quad notation (x.x.x.x)";
    cout << "\nwith each section seperated by a space: ";
    cin >> a >> b >> c >> d;

    // Do calculations to convert IP to base 10
    a *= 16777216;
    b *= 65536;
    c *= 256;
    base10IP = a + b + c + d;

    // Output new IP address
    cout << "\nThe converted address is: " << base10IP << '\n';
   }

这是将IP转换为十进制的JAVA类:

/**
 * @author Charles Johnson
 * from http://www.technojeeves.com/joomla/index.php/free/58-convert-ip-address-to-number
*/
public class IpConverter {
  public static void main(String[] args) {
    System.out.println(longToIp(Long.valueOf(args[0], 16)));
  }

  public static String toHex(String ipAddress) {
    return Long.toHexString(IpConverter.ipToLong(ipAddress));
  }

  public static long ipToLong(String ipAddress) {
    long result = 0;
    String[] atoms = ipAddress.split("\\.");

    for (int i = 3; i >= 0; i--) {
        result |= (Long.parseLong(atoms[3 - i]) << (i * 8));
    }

    return result & 0xFFFFFFFF;
  }

  public static String longToIp(long ip) {
    StringBuilder sb = new StringBuilder(15);

    for (int i = 0; i < 4; i++) {
        sb.insert(0, Long.toString(ip & 0xff));

        if (i < 3) {
            sb.insert(0, '.');
        }

        ip >>= 8;
    }

    return sb.toString();
  }
}

另一个将IP转换为十进制的JAVA示例:

String ip="70.30.65.9"; 
String[] addrArray = ip.split("\."); 
long num = 0; 
   for (int i = 0; i < addrArray.length; i++) { 
     int power = 3 - i; 
     num += ((Integer.parseInt(addrArray[i]) % 256 * Math.pow(256, power))); 
   }

PHP函数将IP转换为decimical:

function myip2long($ip) {
  if (is_numeric($ip)) {
       return sprintf( "%u", floatval($ip) );
   } else {
       return sprintf( "%u", floatval(ip2long($ip) ));
     }
}

尝试应用它,例如:

echo myip2long("192.168.1.1");

PHP中将IP转换为decimical的另一个例子:

function myip2long2($ip){
    $d = 0.0;
    $b = explode(".", $ip,4);
      for ($i = 0; $i < 4; $i++) {
         $d *= 256.0;
         $d += $b[$i];
       };
  return $d;
}

这个将为您提供与上面相同的结果:

用于将十进制转换为IP的PHP示例:

function customLong2ip($ip){
  $b=array(0,0,0,0);
  $c = 16777216.0;
  $ip += 0.0;
     for ($i = 0; $i < 4; $i++) {
       $k = (int) ($ip / $c);
       $ip -= $c * $k;
       $b[$i]= $k;
       $c /=256.0;
      };
    $d=join('.', $b);
  return($d);
}