How to find out the server IP address using JavaScript that the browser is connected to

Question

Is there any way you can find the IP of the server that the browser is connected to  For e g  if the browser is accessing http   www google com  can we tell in any way what IP it is connected to  This is very useful in cases where Round-robin DNS is implemented  So say  the first request to a com results in 1 1 1 1  amp  subsequent request result in 1 1 1 2  amp  so on    I couldn t find any way to do it with JavaScript  Is it even possible  If not is there any universal way to find this info out

User · Answer

Actually there is no way to do this through JavaScript  unless you use some external source  Even then  it might not be 100  correct

User · Answer

I believe John s answer is correct  For instance  I m using my laptop through a wifi service run by a conference centre -- I m pretty sure that there is no way for javascript running within my browser to discover the IP address being used by the service provider  On the other hand  it may be possible to address a suitable external resource from javascript  You can write your own if your own by making an ajax call to a server which can take the IP address from the HTTP headers and return it  or try googling  find my ip   The cleanest solution is probably to capture the information before the page is served and insert it in the html returned to the user   See How to get a viewer  39 s IP address with python  for info on how to capture the information if you are serving the page with python

User · Answer

x000D   x000D   lt script type  application javascript  gt    function getIP json        document write  My public IP address is     json ip        lt  script gt   lt script type  application javascript  src  http   ipinfo io  format jsonp amp callback getIP  gt  lt  script gt  x000D   x000D   x000D

User · Answer

I think you may use the callback from a JSONP request or maybe just the pure JSON data using an external service but based on the output of javascript location host that way     getJSON     freegeoip net json     window location host     callback     function data        console warn  Fetching JSON data              Log output to console     console info JSON stringify data  null  2          I ll use this code for my personal needs  as first I was coming on this site for the same reason   You may use another external service instead the one I m using for my needs  A very nice list exist and contains tests done here https   stackoverflow com a 35123097 5778582

User · Answer

Not sure how to get the IP address specifically  but the location object provides part of the answer   e g  these variables might be helpful    self location host - Sets or retrieves the hostname and port number of the location self location hostname - Sets or retrieves the host name part of the location or URL

User · Answer

I am sure the following code will help you to get ip address    lt script type  application javascript  gt      function getip json         alert json ip      alerts the ip address        lt  script gt    lt script type  application javascript  src  http   www telize com jsonip callback getip  gt  lt  script gt

User · Answer

You cannot get this in general   From Javascript  you can only get the HTTP header  which may or may not have an IP address  typically only has the host name    Part of the browser s program is to abstract the TCP IP address away and only allow you to deal with a host name

User · Answer

Can do this thru a plug-in like Java applet or Flash  then have the Javascript call a function in the applet or vice versa  OR have the JS call a function in Flash or other plugin   and return the IP  This might not be the IP used by the browser for getting the page contents  Also if there are images  css  js -  browser could have made multiple connections  I think most browsers only use the first IP they get from the DNS call  that connected successfully  not sure what happens if one node goes down after few resources are got and still to get others - timers  ajax that add html that refer to other resources    If java applet would have to be signed  make a connection to the window location  got from javascript  in case applet is generic and can be used on any page on any server  else just back to home server and use java net Address to get IP

User · Answer

Try this as a shortcut  not as a definitive solution  see comments     lt script type  text javascript  gt      var ip   location host      alert ip    lt  script gt    This solution cannot work in some scenarios but it can help for quick testing  Regards

User · Answer

Fairly certain this cannot be done  However you could use your preferred server-side language to print the server s IP to the client  and then use it however you like  For example  in PHP    lt script type  text javascript  gt      var ip     lt  php echo   SERVER  SERVER ADDR      gt        alert ip    lt  script gt    This depends on your server s security setup though - some may block this

[javascript] How to find out the server IP address (using JavaScript) that the browser is connected to?

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