[C#.NET] 클라이언트 컴퓨터 IP 찾기 / 특정 아이피에서만 보기 > 기술자료

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string strUserHostAddress = HttpContext.Current.Request.UserHostAddress;
            string strREMOTE_ADDR = Context.Request.ServerVariables["REMOTE_ADDR"];
            string strUserHostName = Request.UserHostName;
           
            string strUserIP = string.Empty;
            if (HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"] == null)
                strUserIP = HttpContext.Current.Request.UserHostAddress;
            else
                strUserIP = HttpContext.Current.Request.ServerVariables["HTTP_X_FORWARDED_FOR"];

            #region IPv4
            string strUserIPv4 = string.Empty;
            foreach (IPAddress _IP in Dns.GetHostAddresses(HttpContext.Current.Request.UserHostAddress))
            {
                if (_IP.AddressFamily.ToString() == "InterNetwork")
                {
                    strUserIPv4 = _IP.ToString();
                    break;
                }
            }

            if (strUserIPv4 == string.Empty)
            {
                foreach (IPAddress _IP in Dns.GetHostAddresses(Dns.GetHostName()))
                {
                    if (_IP.AddressFamily.ToString() == "InterNetwork")
                    {
                        strUserIPv4 = _IP.ToString();
                        break;
                    }
                }
            }
            #endregion

            //화면에 정보를 출력
            writer.Write("UserHostAddress : " + strUserHostAddress + "<br />");
            writer.Write("Remote Address : " + strREMOTE_ADDR + "<br />");
            writer.Write("UserHostName : " + strUserHostName + "<br />");
            writer.Write("UserIP : " + strUserIP + "<br />");
            writer.Write("UserIPv4 : " + strUserIPv4 + "<br />");



자료출처
http://kdmsong.tistory.com/entry/ClientIPAddress