ASP.NET: How can I get the domain name without any subdomains?

Question

I've been searching here on SO but I can't seem to find the answer to this question. I'm having a heck of a time figuring out if there's a method that will give me just the main domain from the HttpContext.Current.Request.Url?

Examples:

http://www.example.com > example.com
http://test.example.com > example.com
http://example.com > example.com

Thanks in advance.

Edit

just to clarify a bit. This is for use on my own domains only and not going to be used on every domain in existence.
There's currently three suffixes that I need to be able to deal with.

• .com
• .ca
• .local

Answer 1

public static void Main() {
    var uri = new Uri("http://test.example.com");

    var fullDomain = uri.GetComponents(UriComponents.Host, UriFormat.SafeUnescaped);
    var domainParts = fullDomain
        .Split('.') // ["test", "example", "com"]
        .Reverse()  // ["com", "example", "test"]
        .Take(2)    // ["com", "example"]
        .Reverse(); // ["example", "com"]
    var domain = String.Join(".", domainParts);
}