whois youtu.be/SYRZUiPcjnw

Domain:
Turn off cache
Try for webbased whois (don't expect it to work yet)

youtu.be/SYRZUiPcjnw

checking....youtu.be/SYRZUiPcjnw
$ whois youtu.be/SYRZUiPcjnw
No whois server is known for this kind of object.