I'm developing a simple app in c#, that can check if a domain name is available to puchase for a specific tld. 
The method: I downloaded a whois-server list, I send the domain name to its whois server with a TCP client on the protocol 43, and check the servers answer.
The problem: more countries has the same whois server: "whois.ripe.net" .
If I send the full domain name(with tld), the server's answer is always "No entries found in source RIPE.". If I send the domain name without tld, I dont get any tld specific data about the status of the domain name. 

The method I use:

```
private string GetWhoisInformation(string whoisServer, string url)
    {
        try
        {
            StringBuilder stringBuilderResult = new StringBuilder();
            TcpClient tcpClinetWhois = new TcpClient(whoisServer, 43);
            NetworkStream networkStreamWhois = tcpClinetWhois.GetStream();
            BufferedStream bufferedStreamWhois = new BufferedStream(networkStreamWhois);
            StreamWriter streamWriter = new StreamWriter(bufferedStreamWhois);

            streamWriter.WriteLine(url);
            streamWriter.Flush();

            StreamReader streamReaderReceive = new StreamReader(bufferedStreamWhois);

            while (!streamReaderReceive.EndOfStream)
                stringBuilderResult.AppendLine(streamReaderReceive.ReadLine());
            return stringBuilderResult.ToString();
        }
        catch
        {
            return "lekérdezés sikertelen";
        }
    }

```

Example:
I do:

```
GetWhoisInformation("whois.ripe.net", "pokerstars.hu")

```

The server's answer:

```
%ERROR:101: no entries found
%
% No entries found in source RIPE.

```

for the next command:

```
GetWhoisInformation("whois.ripe.net", "pokerstars")

```

the result contains several blocks like this:

```
% Information related to '80.65.254.128 - 80.65.254.159'

inetnum:        80.65.254.128 - 80.65.254.159
netname:        Pokerstars
descr:          Hosting
country:        GB
admin-c:        DC77-RIPE
tech-c:         JM2352-RIPE
status:         assigned PA
mnt-by:         manx-telecom-mnt
changed:        bill.hogg@manx-telecom.com 20101123
source:         RIPE

```

There's no information about the domain name "pokerstars.hu". Of course, I get exactly the same answers if I want to check pokerstars.va. Pokerstars.hu is a registred domain, pokerstars.va is not.

How can I find the correct status of a domain name?