go
faycomp.com and mail.faycomp.com point to 89.108.74.55.

faycomp.com
a records
 
+ 89.108.74.55 89.108.72.0/22 AS39561  
+ ---  

mail.faycomp.com
a records
 
+ 89.108.74.55 89.108.72.0/22 AS39561  
+ ---  
ip numbers of host
89.108.74.55
hostnames sharing ip with a-records
faycomp.com
mail.faycomp.com
domains using this as mailserver
faycomp.com