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mx2.mail.telkom.net has one IP number , which also has a corresponding reverse pointer. b.mx.mail.telkomhosting.com point to the same IP. telkom.net.id use this as a mailserver. mail.telkom.net has one IP number. mx2.mail.telkom.net is hosted on a server in Indonesia.

mx2.mail.telkom.net
a records
 
+ 125.160.17.194 125.160.17.0/24 AS17974 -
+ --- -

mail.telkom.net
a records
 
+ 202.134.0.12 202.134.0.0/24 AS17974  
+ ---  
ip numbers of host
125.160.17.194
ptrs of ip numbers
mx2.mail.telkom.net
ip numbers using ptr to this host
125.160.17.194
hostnames sharing ip with a-records
b.mx.mail.telkomhosting.com
domains using this as mailserver
telkom.net.id