go
sjl-mbox1.sjl.youtube.com has one IP number , which also has a corresponding reverse pointer. mail.youtube.com cnames to this hostname. youtu.be, youtube.hk, youtube.se, youtube.hu, youtube.us and at least 33 other hosts use this as a mailserver. sjl-mbox1.sjl.youtube.com is hosted on a server in United States.

sjl-mbox1.sjl.youtube.com
a records
 
+ 208.65.153.154 208.65.152.0/22 AS36561 -
+ --- -
ip numbers of host
208.65.153.154
ptrs of ip numbers
sjl-mbox1.sjl.youtube.com
ip numbers using ptr to this host
208.65.153.154
hostnames pointing here by cname
mail.youtube.com
domains using this as mailserver
you-tube.com
youtu.be
youtube-nocookie.com
youtube.biz
youtube.ca
youtube.co.il
youtube.co.in
youtube.co.kr
youtube.co.nz
youtube.co.uk
youtube.com
youtube.com.au
youtube.com.br
youtube.com.es
youtube.com.hk
youtube.com.mx
youtube.com.tw
youtube.cz
youtube.de
youtube.es
youtube.fr
youtube.hk
youtube.hu
youtube.ie
youtube.in
youtube.info
youtube.it
youtube.jp
youtube.kr
youtube.nl
youtube.pl
youtube.ru
youtube.se
youtube.tv
youtube.us
youtube.ws
youtubed.com
yputube.com