This is .NET Class library implementing a WHOIS client.
To install this library into your application, use the NuGet repository.
PM> Install-Package WhoisClient.NET-VS2015
using Whois.NET;
...
var result = WhoisClient.Query("192.41.192.40");
Console.WriteLine("{0} - {1}", result.AddressRange.Begin, result.AddressRange.End); // "199.71.0.0 - 199.71.0.255"
Console.WriteLine("{0}", result.OrganizationName); // "American Registry for Internet Numbers"
Console.WriteLine(string.Join(" > ", result.RespondedServers)); // "whois.arin.net" Make sure nuget.exe is in your path for building release.