How do I get the domain type using TC ?

Sys.DomainName probably isn't what you are looking for, it give you the network domain that your PC belongs to. I'm guessing you want to grab the TLD of a website you have opened in a browser. There isn't a specific function in TC that will retrieve that for you, but it's not too hard to parse the URL. Here's an example in python:

def get_TLD(url):
  #Split the url until it's only the hostname split into a list
  baseURL = url.split('//')[1].split('/')[0].split('.')
  #Return the last item in the list, which will be com or whatever else
  return baseURL[len(baseURL) - 1]

def test():
  #Sends the results to log
  url = str(Aliases.browser.Page('somePage').URL)
  Log.Message(get_TLD(url))

Only problem is it doesn't completely work with TLDs that have two parts (e.g. co.uk). But if you are testing any websites with a possible two part TLD you can add some logic to the get_TLD function so that it returns the full co.uk if it first grabs .uk

It sounds like you want the the domain name of your computer? SYS.domainname is for the currently loggen in user which isn't always the name of the domain. You wnat the system domain name.

Try this:

dotNET.System_DirectoryServices_ActiveDirectory.Domain.GetComputerDomain().ToString();

You will have to add the System.DirectoryServices component to your CLR bridge to access this.