Get Address,City,County From IP address

First you must create account on Here to get API_Key
you can read document from Here
once you get API_Key you can use Code to get data :

private String GetCityName(string IP)
        {
            string _City = "";
            try
            {
                string _URL = null;
                string _ApiKey = "XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX";
                _URL = "http://api.ipinfodb.com/v3/ip-country/?key=" + _ApiKey + "&format=xml&ip=" + IP;

                //Get google response as XML doc
                dynamic xmlDoc = new System.Xml.XmlDocument();
                xmlDoc.Load(_URL);
                System.Xml.XmlNode _root = xmlDoc.DocumentElement;
                System.Xml.XmlNodeList _CityName = xmlDoc.GetElementsByTagName("cityName");
                System.Xml.XmlElement _CityNameElement = (System.Xml.XmlElement)_CityName.Item(0);
                _City = _CityNameElement.FirstChild.Value;
            }
            catch (Exception ex)
            {
                _City = "CANADA";
            }
            //End Try
            return _City;
        }