Member Avatar for ilikerps

Hello, I was just wondering if it is possible in Java to get the host's IP address, as seen on the Internet, not network or by the computer itself. I mean, getting something like 87.253.145.35 instead of something like 192.168.1.100 or 127.0.0.1.

Or, if not, is there any popular/known server that has a static IP address with which I could open a Socket and have it tell me my IP address?

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  • 7 Replies
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  • 2 Years Discussion Span
  • Latest Post Latest Post by davido82
Member Avatar for Ancient Dragon

I don't know how its done, but here is an example

Member Avatar for ilikerps

Ah, well, that won't really work in Java by itself, but, for those who care, this works (by utilizing a website like the one above):

try {
			Socket sock = new Socket("www.edpsciences.org", 80);
			BufferedReader is = new BufferedReader(new InputStreamReader(sock.getInputStream()));
			PrintWriter os = new PrintWriter(sock.getOutputStream(), true);

                           // the actual URL is www.edpsciences.org/htbin/ipaddress (a ruby page)
			os.println("GET /htbin/ipaddress HTTP/1.0");
			os.println(); // two new lines are required to send a command
                     	
                           // the page has x number of lines with unnecessary information before it says "Your IP address"....
			String line = "";
			while(line.indexOf("Your IP address") == -1)
			{
				line = is.readLine();
			}
                                                // do a little substringing, and we'll have our answer (the ip address is inbetween "<B> " and " </B>"
			String ipAddr = line.substring(line.indexOf("<B> ")+4, line.indexOf("</B>")-1);
	    } 
	    catch (Exception e)
	    {
	    	e.printStackTrace();
	    }

If I could figure out what the index URL for whatismyip.org is (which has only 1 thing on it: the IP address), that would be even better. I've tried a lot of extensions to "index" and some to "default"....

Member Avatar for ilikerps

Well, I have tried using that, and unless there is something I'm missing, that only gives addresses such as 192.168.1.100 when used with getLocalHost().getHostAddress(); . I was looking for the global/public IP address.

Member Avatar for freesoft_2000
Member Avatar for davido82

Hello, I was just wondering if it is possible in Java to get the host's IP address, as seen on the Internet, not network or by the computer itself. I mean, getting something like 87.253.145.35 instead of something like 192.168.1.100 or 127.0.0.1.

Or, if not, is there any popular/known server that has a static IP address with which I could open a Socket and have it tell me my IP address?

This is how I did it:

public String getMyPublicIP(){
        try {
            URL autoIP = new URL("http://www.whatismyip.com/automation/n09230945.asp");
            BufferedReader in = new BufferedReader( new InputStreamReader(autoIP.openStream()));
            String ip_address = (in.readLine()).trim();

            return ip_address;

         }catch (Exception e){
	    	e.printStackTrace();

            return "ERROR";
	    }
    }
Edited by davido82 because: n/a
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