go
alt4.gmail-smtp-in.l.google.com has one IP number , but the reverse is mail-yw0-f43.google.com. mail-yw0-f43.google.com point to the same IP. gmail.ie, gmail.ug, gmail.lu, gmail.ge, gmail.com and at least seven other hosts use this as a mailserver. gmail-smtp-in.l.google.com has one IP number. alt4.gmail-smtp-in.l.google.com is hosted on a server in United States.

alt4.gmail-smtp-in.l.google.com
a records
 
+ 209.85.211.43 209.85.211.0/24 AS15169 mail-yw0-f43.google.com
+ --- mail-yw0-f43.google.com

gmail-smtp-in.l.google.com
a records
 
+ 209.85.212.38 209.85.212.0/24 AS15169  
+ ---  
ip numbers of host
209.85.211.43
ptrs of ip numbers
mail-yw0-f43.google.com
hostnames sharing ip with a-records
mail-yw0-f43.google.com
domains using this as mailserver
g-mail.com.ph
gemail.com.br
gmail.co.in
gmail.com
gmail.com.hk
gmail.ge
gmail.ie
gmail.lu
gmail.ug
googlemail.com
imgmailtest.com
primatel.com.bn