Found 2 domains on youtu.be (173.194.116.167):

1. o-o.preferred.belwue-str1.v23.lscache1.c.youtube.com  []
2. o-o.preferred.kabelbw-str1.v22.nonxt6.c.youtube.com  []


IP info: 173.194.116.167
ISP: Google
Geo: United States / Mountain View