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IP address using Javascript

Javascript is unable to get (nor stores somewhere) the client IP, however javascript is able to create Http requests, and server side languages are able to retrieve the user public IP, so you could use this as advantage. In other words, if you want to retrieve the public IP of an user you'll depend from a request to any server in order to retrieve the IP. However, with the introduction of the WebRTC, you'll be able to retrieve the private IP of the user with a trick using RTCPeerConnection.




Using webRTC (get private IP)



The RTCPeerConnection interface allow you to create a WebRTC connection between your computer and a remote peer. However, we are going to create an "interrupted" version of it in order to retrieve the IP of the client using only javascript.
The createOffer method initiates the creation of a session description protocol (SDP) which offer information about any MediaStreamTracks attached to the WebRTC session, session, codes and any candidates already gathered by the ICE agents (which contains our goal, the IP).
In older versions, this method uses callbacks. However, now return a value based in a Promise that returns the information that we need when fullfilled:

Note: the pure javascript implementation will return the client private IP, not the public.


CODE:- 

<!DOCTYPE html>
<html>

<head>
  <meta charset="utf-8" />
  <title>Ip address</title>
  <link rel="stylesheet" href="style.css" />
  <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.0.0/jquery.js"></script>
  <script type="text/javascript">
    var getIPAddress = function() {
      $.getJSON("https://jsonip.com?callback=?", function(data) {
        alert("Your IP address is :- " + data.ip);
      });
    };
  </script>
</head>

<body>
  <div>
    <h3>
      Get Client Machine IP Address using JavaScript and JSON
    </h3>
    
  </div>
</body>

</html>


OUTPUT:-

Get Client Machine IP Address using JavaScript and JSON

Cleck to get IP Address

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