How to display client IP Address

Some time you may want to show or capture client IP address for security reasons. Here are sample codes specific to language/script. 

PHP :

 echo $_SERVER[‘REMOTE_ADDR'];  

Java :

import java.net.InetAddress;
import java.net.UnknownHostException;
import java.util.logging.Level;
import java.util.logging.Logger;


public class IPAddress{
    public static void main(String[] a) {

        try {
            InetAddress thisIp = InetAddress.getLocalHost();
            System.out.print(thisIp.getHostAddress());     
        } catch (UnknownHostException ex) {
            Logger.getLogger(study.class.getName()).log(Level.SEVERE, null, ex);
        }

    }
}

C# :

protected string GetIPAddress()
{
    System.Web.HttpContext context = System.Web.HttpContext.Current; 
    string ipAddress = context.Request.ServerVariables["HTTP_X_FORWARDED_FOR"];

    if (!string.IsNullOrEmpty(ipAddress))
    {
        string[] addresses = ipAddress.Split(',');
        if (addresses.Length != 0)
        {
            return addresses[0];
        }
    }

    return context.Request.ServerVariables["REMOTE_ADDR"];
}

VB.Net :

Public Shared Function GetIPAddress() As String
    Dim context As System.Web.HttpContext = System.Web.HttpContext.Current
    Dim sIPAddress As String = context.Request.ServerVariables("HTTP_X_FORWARDED_FOR")
    If String.IsNullOrEmpty(sIPAddress) Then
        Return context.Request.ServerVariables("REMOTE_ADDR")
    Else
        Dim ipArray As String() = sIPAddress.Split(New [Char]() {","c})
        Return ipArray(0)
    End If
End Function

Javascript :

$.getJSON('//freegeoip.net/json/?callback=?', function(data) {
  obj = JSON.parse(JSON.stringify(data, null, 2));
  $('#ip').html(obj.ip);
});