I'm not sure if we talk about the same "domains" here - I meant data domains defined within DataHub (i.e. the same infrastructure, the same DataHub installation and configuration, etc., just possibly restricted user access to certain domains if necessary. It seems to me from your response that you interpreted my suggestion as referring to Internet domains (resolved by domain name servers).
Then again, maybe it's the best if you describe your use case (what you want to achieve with DataHub) in more detail, so that it's clearer which solution is the most appropriate one (or at least suitable 🙂 ).