Take note that .co.nr is not a free domain registration services, .co.nr is providing domain redirection service. It means if we don't have our existing website it is no point to register .co.nr domain.
I think you want to say they don't give us DNS settings from which we can point our domain name servers to our host.
Even dot.tk does the same. It just redirects our original url, it doesn't actually provides DNS offer.