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IPAddress conversion from String(192.168.1.11) to Byteorderform

Posted on 2004-10-05
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Last Modified: 2008-03-17
Hi,

 Could i know how to convert IPAddress from String(192.168.1.11) to Byteorderform.

regards,
alpjose
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Question by:alpjose
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20 Comments
 
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Expert Comment

by:armoghan
ID: 12224379
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Expert Comment

by:cjjclifford
ID: 12224397
Have a look at java.net.InetAddress:

public static InetAddress InetAddress.getByName()
public byte[] InetAddress.getAddress()

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by:expertmb
ID: 12224577
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LVL 5

Expert Comment

by:Naeemg
ID: 12224581
check this code.

    try
    {
      byte[] thisBytes = java.net.InetAddress.getByName("192.168.1.11").getAddress();
      for(int i = 0; i < thisBytes.length; i++)
        System.out.println(thisBytes[i]);
    }
    catch(UnknownHostException ex)
    {
    }
 

Bye,
Naeem Shehzad Ghuman
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Expert Comment

by:CEHJ
ID: 12224584
>>to Byteorderform.

As what Java type?
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Author Comment

by:alpjose
ID: 12224794
For the IPAddress 192.168.1.11 ,  the byte order address is 2147483647.
This is Network Byte order.
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Expert Comment

by:CEHJ
ID: 12224807
You mean you want it as an integer?
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Author Comment

by:alpjose
ID: 12224816
Yes i want it as integer.
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LVL 5

Expert Comment

by:Naeemg
ID: 12224824
have u tried my code?

try
    {
      byte[] thisBytes = java.net.InetAddress.getByName("192.168.1.11").getAddress();
      for(int i = 0; i < thisBytes.length; i++)
        System.out.println(thisBytes[i]);
    }
    catch(UnknownHostException ex)
    {
    }
 

Bye,
Naeem Shehzad Ghuman
0
 

Author Comment

by:alpjose
ID: 12224836
yes i tried, but i am not getting the Network Byte order.
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Expert Comment

by:CEHJ
ID: 12224932
>>
the byte order address is 2147483647.
This is Network Byte order.
>>

Are you certain about that?
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Expert Comment

by:sciuriware
ID: 12224994
An XDR decoding should give you byte order.
And JAVA is completely Network Byte Order internally.
You might reverse the sequence in the code above .....
;JOOP!
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Author Comment

by:alpjose
ID: 12224998
I am not very sure,

i have used the below code to get the Value.

int getAddressInByteOrder(String strIPAddress) {
            StringTokenizer st = new StringTokenizer(strIPAddress, .);
            int m = 256, n = 1, o = 2, p = 3;
            int a1 = 0, b1 = 0, c1 = 0, d1 = 0;
            while (st.hasMoreElements()) {
                  a1 = Integer.parseInt((String) st.nextElement());
                  b1 = Integer.parseInt((String) st.nextElement());
                  c1 = Integer.parseInt((String) st.nextElement());
                  d1 = Integer.parseInt((String) st.nextElement());
            }
            int com = 0;
            com += (d1 * Math.pow(m, p));
            com += (c1 * Math.pow(m, o));
            com += (b1 * Math.pow(m, n));
            com += (a1);
            return com;
      } // ending getAddressInByteOrder

I got the required result for 192.168.1.x range , but for some range of Address i am not getting the correct value.

for the range 134.27.57.127, i am supposed to get -197583994 but i am getting -2147483515.
So i would like to know if there is any other way to do this.
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Expert Comment

by:sciuriware
ID: 12225018
DO NOT USE Math.pow() WHEN DEALING WITH INTEGERS!
;JOOP!
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Expert Comment

by:CEHJ
ID: 12225057
>>for the range 134.27.57.127,

It's not a range - it's an address ;-)

>>i am supposed to get -197583994

I don't think that's right

>>but i am getting -2147483515.

and i don't think that is either.

Try to get a definitive ip to int so it can be replicated/tested
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Accepted Solution

by:
CEHJ earned 100 total points
ID: 12225092
This is the simplest way:

     InetAddress ip = InetAddress.getByName("134.27.57.127");
     byte[] bytes = ip.getAddress();
     int address = new java.math.BigInteger(bytes).intValue();
     System.out.println(address);
0
 

Author Comment

by:alpjose
ID: 12225101
Pls let me know how to do.
I mean to say 134.27.57.127 's range ie  134.27.57.128...
Fine for this IP , let me know how to get definitive ip.

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Expert Comment

by:CEHJ
ID: 12225130
>>let me know how to get definitive ip.

As in my code above ;-) That's for network byte order
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