go
youtube..com and youtube.l.google.com point to 208.117.236.69.

.youtube.com
a records
 
+ 208.117.236.69 208.117.236.0/24 AS36561 youtube.com
+ --- youtube.com

youtube..com
a records
 
+ 208.117.236.69 208.117.236.0/24 AS36561 youtube.com
+ --- youtube.com

youtube.l.google.com
a records
 
+ 208.117.236.69 208.117.236.0/24 AS36561 youtube.com
+ --- youtube.com

youtube.com
ptr records
 
+ 208.117.236.69 208.117.236.0/24 AS36561 -
+ --- -
ip numbers of host
208.117.236.69
ptrs of ip numbers
youtube.com
hostnames sharing ip with a-records
.youtube.com
youtube..com
youtube.l.google.com