go
mail1.bankmandiri.co.id point to 202.155.2.178.

mail1.bankmandiri.co.id
a records
 
+ 202.155.2.178 202.155.2.0/24 AS4795  
+ ---  
ip numbers of host
202.155.2.178
hostnames sharing ip with a-records
mail1.bankmandiri.co.id
domains using this as mailserver
bankmandiri.co.id