ThirdPartyAPI/Common/Utility/GetClientIpAddress.cs

using Microsoft.Owin;
using System.Net;
using System.Net.Http;
using System.Web;

namespace Common.Utility
{
    public class GetClientIpAddress
    {
        public string GetIpAddress(HttpRequestMessage request)
        {
            if (request.Properties.ContainsKey("MS_HttpContext"))
            {
                return IPAddress.Parse(((HttpContextBase)request.Properties["MS_HttpContext"]).Request.UserHostAddress).ToString();
            }
            if (request.Properties.ContainsKey("MS_OwinContext"))
            {
                return IPAddress.Parse(((OwinContext)request.Properties["MS_OwinContext"]).Request.RemoteIpAddress).ToString();
            }
            return null;
        }
    }
}