go
mail.dmstelecoms.com point to 66.220.24.52.

mail.dmstelecoms.com
a records
 
+ 66.220.24.52 66.220.0.0/19 AS6939  
+ ---  
ip numbers of host
66.220.24.52
hostnames sharing ip with a-records
mail.dmstelecoms.com
domains using this as mailserver
dmstelecoms.com