convert json result to my c# model

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C#

JSON.NET

My Json is 
{"headers":
["start_ip_int","end_ip_int","start_ip_oct","end_ip_oct","continent","country","country_code","country_cf","region","state","state_code","state_cf","city","city_cf","postal_code","area_code","time_zone","latitude","longitude","dma","msa","connection_type","line_speed","ip_routing_type","asn","sld","tld","organization","carrier","anonymizer_status","home","organization_type","naics_code","isic_code"]"
"results":{"120.74.45.21":["2856990464","2856990719","140.74.65.0","370.64.55.255","north america","united states","us","99","northeast","new york","ny","80","new york","61","10020","212","-5","40.75891","-73.97902","501","35620","tx","high","fixed","5049","","","dean witter financial services","morgan stanley & co.","","false","Finance","520000","K6400"
]
},"timeSpent":6}

I wanted to convert into model. I got the link where i can convert the json to appropriate model.

public class RootObject
   {
       public List<string> headers { get; set; }
       public Results results { get; set; }
       public int timeSpent { get; set; }
   }

   public class Results
   {
       public IList<string> IpAddress { get; set; }
   }

But the problem is in json result

"results":{"120.74.45.21":

this is dynamic
so in Results class the property IpAddress is not mapping correctly.

JavaScriptSerializer js = new JavaScriptSerializer();
                            var objText = reader.ReadToEnd();
                            RootObject obj1 = new RootObject();

                            Results obj = new Results();
                            obj.IpAddress.Add(ipAddress);
                            obj1.results = obj;
                            obj1 = (RootObject)js.Deserialize(objText, typeof(RootObject));

in obj1 i am not getting the results. how can i fix this. Need your suggestion


otherwise kindly help me how i can achieve this
My requirement:
in json we have header and response
i want to map header with the the corresponding response.
in current case

"start_ip_int" :  2856990464
"end_ip_int"   :  2856990719
"start_ip_oct" :  140.74.65.0
"end_ip_oct"   :  370.64.55.255  
"continent"    :  north america