JSP - Website - Need to find user's domain name

Extremely new to Java.

Creating a two websites - one is secure, one is non-secure. Based on whatever domain (i.e. .com, .org, .gov, etc.) will determine what site the user will be redirected to. Anyone have any ideas of how to accomplish this. My initial thought is that if I can easily find the domain from which the user is coming from, I could accomplish this. However, I have only found how to retrieve the user's IP address, which doesn't really help because they could be accessing the Internet through a firewall (internal IP address). Any suggestions or help to point me in the right direction would be most appreciated! Thanks in advance.

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Mick BarryJava DeveloperCommented:
You can't.
not really sure this would work, try using getRemoteHost() instead of getRemoteAddress() from a servlet request, it will return the REMOTE_HOST property (fully qualified name) BUT  the container is not required to resolve it so if can not or refuses to, it will still give you the IP address


I suggest you to read folloig discussions
some javascript related code that was discussed in above links could help you

and also some SSI related work could help u.


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delete the other link you have posted as it is not necessary :-)
Try running the following with the parameters

nslookup www.xxx.yyy.zzz

import java.io.*;

public class RunAsync {

    public static void main(String args[]) {

     try {

        if(args.length < 1) {
          System.out.println("Usage: java RunAsync <command string>");
        Process pro = null;
        if (args.length > 1) {
          pro = Runtime.getRuntime().exec(args);
        else {
          pro = Runtime.getRuntime().exec(args[0]);
        InputStream error = pro.getErrorStream();
        InputStream output = pro.getInputStream();
        Thread err = new Thread(new OutErrReader(error));
        Thread out = new Thread(new OutErrReader(output));
     catch(java.io.IOException e) {
     catch(java.lang.InterruptedException e) {


    static class OutErrReader implements Runnable {
      InputStream is;

      public OutErrReader(InputStream is) {
        this.is = is;

      public void run() {
        try {
          BufferedReader in = new BufferedReader(new InputStreamReader(is));
          String temp = null;
          while((temp = in.readLine()) != null) {
        catch(Exception e) {
Mick BarryJava DeveloperCommented:
Doesn't matter what you do, firewalls/proxies will still hide the details of the actual client.
If they're using a proxy there could be a problem. This, on the other hand,

>>because they could be accessing the Internet through a firewall (internal IP address).

is an unnecessary worry: in order to establish a TCP/IP connection to the client a routable address is required. This can't be a 'private' one, or you'd have no conversation in the first place.
split points between sudhakar_koundinya and CEHJ
Mick BarryJava DeveloperCommented:
better including me in the split for mention of firewall problems :)
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