easy way to get the top level domain?

Question

i want to get the domain extention (at least i hope it is called this way) from the site name the user is currently on.

so from www.bbc.co.uk it's co.uk and www.google.com = .com https://stackoverflow.com/questions/ask = .com

etc.

especially the ones with the double name (like co.uk) gives me headaches....

EDIT as i understand from the comments, co.uk is not a top level domain? that makes life easier! EDIT new name (top level domain) in the title

score 3 · Accepted Answer · answered Jun 03 '10 at 19:43

3

It's called a toplevel domain (tld) but for the BBC that's just "uk", not "co.uk".

What you want does not follow a standard so you'll need a table to check 'potential' pseudo-tld's

answered Jun 03 '10 at 19:43

H H

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score 2 · Answer 2 · answered Jun 03 '10 at 19:40

2

The .co.uk is the .co subdomain of the .uk tld. This question doesn't make sense in terms of the actual structure of dns.

answered Jun 03 '10 at 19:40

Stuart

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always thought .co.uk was 'one' and not a subdomain – Michel Jun 03 '10 at 20:45
There are other subdomains in the .uk like .ac.uk which is similar to .edu. The '.' is always a separator. – Stuart Jun 05 '10 at 12:44

live2 · Answer 3 · 2018-02-07T03:14:06.573

The PublicSuffix project from mozilla is the solution. It is a maintained list of TLD.

You can use the following nuget package Nager.PublicSuffix.

PM> Install-Package Nager.PublicSuffix

Example

var domainParser = new DomainParser(new WebTldRuleProvider());

var domainName = domainParser.Get("sub.test.co.uk");
//domainName.Domain = "test";
//domainName.Hostname = "sub.test.co.uk";
//domainName.RegistrableDomain = "test.co.uk";
//domainName.SubDomain = "sub";
//domainName.TLD = "co.uk";

score 1 · Answer 4 · edited May 23 '17 at 12:26

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See this question

Regular expression to retrieve domain.tld

The .NET URI class can also retrieve the hostname, of course.

edited May 23 '17 at 12:26

Community

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answered Jun 03 '10 at 19:40

Gelatin

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But this does not really answer the question, especially not the co.uk case. – H H Jun 03 '10 at 19:54

score 0 · Answer 5 · answered Jun 03 '10 at 19:41

0

It's called the Top Level Domain and then there's the first sub-domain, which not everyone uses. It's because the first DNS did reverse entries on the split list, to route faster, so it would've parsed to

uk -> co -> example -> www

answered Jun 03 '10 at 19:41

jcolebrand

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easy way to get the top level domain?

5 Answers5