var whois = new WhoisLookup();
var response = whois.Lookup("github.com");

Console.WriteLine(response.Content);

// Domain Name: github.com
// Registry Domain ID: 1264983250_DOMAIN_COM-VRSN
// Registrar WHOIS Server: whois.markmonitor.com
// Registrar URL: http://www.markmonitor.com
// ...

var response = whois.Lookup("github.com");
var json = JsonConvert.SerializeObject(response.ParsedResponse, Formatting.Indented);

Console.WriteLine(json);

// {
//   "DomainName": "github.com",
//   "RegistryDomainId": "1264983250_DOMAIN_COM-VRSN",
//   "Expiration": "2020-10-09T20:20:50+02:00",
//   "Registrar": {
//     "Name": "MarkMonitor, Inc.",
//     "Url": "http://www.markmonitor.com",
// ...

public async Task<string> GetWhois()
{
    var whois = new WhoisLookup();
    var response = await whois.LookupAsync("github.com");
    return response.Content;
}

// Global configuration
WhoisOptions.Defaults.DefaultEncoding = Encoding.ASCII;

// Instance configuration
var lookup = new WhoisLookup();
lookup.Options.ParseWhoisResponse = false;

var lookup = new WhoisLookup();

// Clear embedded patterns
lookup.ClearPatterns()

// Add new pattern
lookup.AddPattern("Domain: {DomainName$}", "Simple Pattern")

// Custom implementation
class MyCustomTcpReader : ITcpReader
{
    ...
}

// Register
TcpReaderFactory.Bind(() => new MyCustomTcpReader());