- about.youtube
- artists.youtube
- blog.youtube
- countdowns.youtube
- devicecertification.youtube
- devicecompliance.youtube
- domaintest.youtube
- health.youtube
- lifeinaday.youtube
- news.youtube
- nflst.youtube
- nic.youtube
- office.youtube
- research.youtube
- rewind.youtube
- songwriters.youtube
- standards.youtube
- trends.youtube
- yoodles.youtube
Registry.Google provides whois for .youtube domains at this page:
https://www.registry.google/whois-lookup/