go
mx.drocha.ru point to 81.177.17.74.

mx.drocha.ru
a records
 
+ 81.177.17.74 81.176.0.0/15 AS8342 xuk.ru
+ --- xuk.ru

xuk.ru
ptr records
 
+ 81.177.17.74 81.176.0.0/15 AS8342 -
+ --- -
ip numbers of host
81.177.17.74
ptrs of ip numbers
xuk.ru
hostnames sharing ip with a-records
mx.drocha.ru