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直接使用TCP协议向WHOIS服务器的43端口发送查询请求即可返回WHOIS信息。
一些国际域名(.COM/.NET/.CC等)需要继续向各注册商的WHOIS服务服务发送查询请求来获取详细信息。
大部分New gTLD来说，服务器是“whois.nic.[后缀]”，例如.red的WHOIS服务器为whois.nic.red。

WHOIS服务器列表：https://whereiswhois.com/

PHP示例

$domain = 'baidu.com';$fs = fsockopen('whois.verisign-grs.com', 43, $errno, $errstr);
if(!$fs){write_line(sprintf('%s: %s', $errno, $errstr));return;
}try
{fwrite($fs, $domain . "\r\n");$whois = file_read_all_bytes($fs);write_line($whois);
}
catch(\Exception $ex)
{write_line($ex->getMessage());
}
finally{fclose($fs);
}function file_read_all_bytes($fs){$response = '';while(!feof($fs)){$response .= fread($fs, 4096);}return $response;
}function write_line($message) : void {echo $message . "\r\n";
}

c#示例

string domain = "baidu.com";Socket client = new(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);try
{client.Connect("whois.verisign-grs.com", 43);byte[] request = Encoding.ASCII.GetBytes(domain + "\r\n");using NetworkStream stream = new NetworkStream(client, true);stream.Write(request, 0, request.Length);using MemoryStream output = new();stream.CopyTo(output);byte[] response = output.ToArray();Console.WriteLine(Encoding.UTF8.GetString(response));
}
catch (Exception e)
{Console.WriteLine(e.ToString());
}