request.getRemoteAddr() returns 0:0:0:0:0:0:0:1 in JSP page

Question

I am trying the following code to get my ip address in a jsp page:

<%
        out.println("Your IP address is " + request.getRemoteAddr());
%>

This prints 0:0:0:0:0:0:0:1, not my ip address. Is this what is suposed to be? Why is not it showing my ip address?

Thanks

Try adding `-Djava.net.preferIPv4Stack=true` to your servlet container startup script — Reimeus, Jul 01 '13 at 20:36
Better answer : http://stackoverflow.com/questions/17964297/using-request-getremoteaddr-returns-00000001 — Jose Manuel Abarca Rodríguez, Mar 18 '15 at 23:14

morgano · Accepted Answer · 2013-07-01T20:12:29.923

2

That's your IP address, but not a IPv4 (xx.xx.xx.xx) but a IPv6 one (xx:xx:xx:xx:xx:xx:xx:xx)

EDIT: if your system is mapping IPv4 from/to IPv6 you can infer the algorithm to change between them by reading this

edited Jul 01 '13 at 20:12

answered Jul 01 '13 at 20:03

morgano

17,210
10
45
56

@bigO [wikipedia's article for IPv6](http://en.wikipedia.org/wiki/Ipv6) mentions a mapping convention between IPv6 and IPv4 and how to do it – morgano Jul 01 '13 at 20:14

score -2 · Answer 2 · answered Jan 21 '16 at 02:17

-2

JSP code:

<html>
<head><title>Hello World</title></head>
<body>
    Hello World!<br/>
    <%
        out.println("Your Host IP address is " + request.getRemoteHost()+"</br>");
        out.println("Your Addr address is " + request.getRemoteAddr()+"</br>");
        out.println("Your Port Post address is " + request.getRemotePort()+"</br>");
    %>
</body>
</html>

Use http://127.0.0.1:8081/hello.jsp gets the result:

Hello World!
Your Host IP address is 0:0:0:0:0:0:0:1
Your Addr address is 0:0:0:0:0:0:0:1
Your Port Post address is 32432

Use http://localhost:8081/hello.jsp gets the result:

Hello World!
Your Host IP address is 0:0:0:0:0:0:0:1
Your Addr address is 0:0:0:0:0:0:0:1
Your Port Post address is 32432

answered Jan 21 '16 at 02:17

Bruce Yo

152
1
12

The results you provided are completely identical for both requests. Is that what you meant to say, that there is no difference? – sorrymissjackson Feb 23 '17 at 11:50
Yes, there is no difference after my careful observation...LOL – Wuaner May 22 '17 at 15:02
Yeh, this is um... an interesting answer... to a question I can't imagine – Robert Pounder Apr 12 '18 at 16:18

request.getRemoteAddr() returns 0:0:0:0:0:0:0:1 in JSP page

2 Answers2