whois changed info from whois.internic.net

I have some code which looks up whois record for .com and extracted Regsitrar info from result from whois.internic.net query and then could do a whois lookup from the registry for full record

BUT they response coming back from whois.internic.net  no longer has Registrar information

I have searched and only found a reference to "shared database registry" but cannot find which server to use to get me the registrar details so I can do a detailed look up - any help?

Rgds
Stephen

string cDomain = txtbox.txt ; 
               // thanks to http://www.sitepoint.com/article/build-whois-lookup-asp-net
                TcpClient objTCPC = new TcpClient();
                objTCPC.Connect("whois.internic.net", 43);
                string strDomain = cDomain + "\r\n";
                byte[] arrDomain = Encoding.ASCII.GetBytes(strDomain);
                Stream objStream = objTCPC.GetStream();
                objStream.Write(arrDomain, 0, strDomain.Length);
 
                StreamReader objSr = new StreamReader
                (objTCPC.GetStream(), Encoding.ASCII);
 
                string strServerResponse = objSr.ReadToEnd();
                strServerResponse = Regex.Replace(strServerResponse, "\n", "<br>");
 
                objTCPC.Close();

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