CODEWITHSUNDEEP
.netdns
Chase Florell
Chase Florell

Reputation: 47377

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

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.

Upvotes: 13

Views: 5960

Answers (4)

sisve
sisve

Reputation: 19781

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);
}

Upvotes: 13

Chase Florell
Chase Florell

Reputation: 47377

Here's the idea that I've come up with.
@SLaks, I'd love to here your thoughts on this.

    ''# First we fix the StackOverflow code coloring issue.
    <Extension()>
    Public Function PrimaryDomain(ByVal url As Uri) As String

        If url.Host.Contains("example.com") Then Return "example.com"
        If url.Host.Contains("example.ca") Then Return "example.ca"
        If url.Host.Contains("example.local") Then Return "example.local"
        If url.Host.Contains("localhost") Then Return "localhost"

        Throw New Exception("The url host was not recognized as a known host name for this domain.")
    End Function

Upvotes: 0

SLaks
SLaks

Reputation: 887453

See here for a list of suffixes that allow arbitrary registrations.

Find the longest suffix of the full domain name in that list, then return everything after the last . before that suffix.

Upvotes: 2

Dani
Dani

Reputation: 15069

Get a list of top level domains, and match every domain with that list, taking only 1 word after the match.

(you might need to add some support for .co. ect...

Upvotes: 0

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