ip-api.com接口（解析 json需要引入Newtonsoft.Json.dll ）：

/// <summary> 
    /// 根据IP 获取物理地址 
    /// </summary> 
    /// <param name="ip">Ip地址</param> 
    /// <returns></returns> 
    public static string GetIpAddress(string ip)
    {
      string url = "http://ip-api.com/json/"+ip+"?lang=zh-CN";
      string result = "";
      WebRequest wrt = null;
      WebResponse wrp = null;
      try
      {
        wrt = WebRequest.Create(url);
        wrt.Credentials = CredentialCache.DefaultCredentials;
 
        wrp = wrt.GetResponse();
        StreamReader sr = new StreamReader(wrp.GetResponseStream(), Encoding.UTF8);
   【本文由：专业的印度服务器 提供,感谢支持】     //获取到的是Json数据
        string html = sr.ReadToEnd();
 
        //Newtonsoft.Json读取数据
        JObject obj = JsonConvert.DeserializeObject<JObject>(html);
        string city = obj["city"].ToString();
        string province = obj["regionName"].ToString();
        result = city.Equals(province) ? city : (province + city);
      }
      catch (Exception)
      {
      }
      finally
      {
        if (wrp != null)
          wrp.Close();
        if (wrt != null)
          wrt.Abort();
      }
      return result;
    }

126.net接口： 

/// <summary> 
    /// 根据IP 获取物理地址 
    /// </summary> 
    /// <param name="ip">Ip地址</param> 
    /// <returns></returns> 
    public static string GetstringIpAddress(string ip)
    {
      string url = "http://ip.ws.126.net/ipquery?ip="+ip;
      string result="";
      WebRequest wrt = null;
      WebResponse wrp = null;
      try
      {
        wrt = WebRequest.Create(url);
        wrt.Credentials = CredentialCache.DefaultCredentials;
 
        wrp = wrt.GetResponse();
        StreamReader sr = new StreamReader(wrp.GetResponseStream(), Encoding.Default);
        //获取到的数据格式：var lo="江苏省", lc="镇江市"; var localAddress={city:"镇江市", province:"江苏省"}
        string html = sr.ReadToEnd();
        string pattern = "{city:\"(?<key1>.*?)\", province:\"(?<key2>.*?)\"}";
        Regex regex = new Regex(pattern, RegexOptions.None);
        Match match = regex.Match(html);
        string city=match.Groups["key1"].Value;
        string province=match.Groups["key2"].Value;
        result = city.Equals(province) ? city : (province + city);
      }
      catch (Exception)
      {
      }
      finally
      {
        if (wrp != null)
          wrp.Close();
        if (wrt != null)
          wrt.Abort();
      }
      return result;
    }

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