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Get all ips with a given range

Posted on 2003-12-11
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Last Modified: 2007-12-19
I am a newbie so please be patient.  I have an IP range in which I would like to find all possible IPs within that range.  Also I'd like to be able to compare ip values in order to see which has a higher number.  I have not been able to find a class that enables me to do such.  Anyone know of anything?
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Question by:tsr50
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CEHJ earned 400 total points
ID: 9923124
You're welcome to use this to convert between numbers and ip addresses, from which you can construct a range:

import java.net.InetAddress;

public class InetRange {

  public static void main(String[] args) {
    long ip = InetRange.ipToLong(args[0]);
    System.out.println(ip);
    System.out.println(longToIp(ip));
  }


  public static String longToIp(long ipAddress) {
     StringBuffer sb = new StringBuffer(15);
     long octetMask = 0xFF;
     long octet1 = (ipAddress >> 24) & octetMask;
     long octet2 = (ipAddress >> 16) & octetMask;
     long octet3 = (ipAddress >>  8) & octetMask;
     long octet4 = (ipAddress >>  0) & octetMask;
     sb.append(octet1).append('.');
     sb.append(octet2).append('.');
     sb.append(octet3).append('.');
     sb.append(octet4);
     return sb.toString();
  }


  public static long ipToLong(String ipAddress) {
      long result = 0;
      try {
           byte[] bytes = InetAddress.getByName(ipAddress).getAddress();
           long octet1 = bytes[0] & 0xFF;
           octet1 <<= 24;
           long octet2 = bytes[1] & 0xFF;
           octet2 <<= 16;
           long octet3 = bytes[2] & 0xFF;
           octet3 <<= 8;
           long octet4 = bytes[3] & 0xFF;
           result = octet1 | octet2 | octet3 | octet4;
      }
      catch(Exception e) {
           e.printStackTrace();
           return 0;
      }
      return result;
  }




  public static String intToIp(int ipAddress) {
    int octet1 = (ipAddress & 0xFF000000) >> 24;
    int octet2 = (ipAddress & 0xFF0000) >> 16;
    int octet3 = (ipAddress & 0xFF00) >> 8;
    int octet4 = ipAddress & 0xFF;
    return new StringBuffer().append(octet1)
                             .append('.')
                             .append(octet2)
                             .append('.')
                             .append(octet3)
                             .append('.')
                             .append(octet4)
                             .toString();
  }

}

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Expert Comment

by:CEHJ
ID: 9930242
8-)
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