go
sun.ru.gw0.ru, mail.ru.gw0.ru, pluto.ru.gw0.ru, uranus.ru.gw0.ru, neptune.ru.gw0.ru and at least one other host are subdomains to this hostname. gw0.ru is a domain controlled by two nameservers at ns0.ru. They are on different IP networks. Incoming mail for gw0.ru is handled by one mailserver at ru.gw0.ru. gw0.ru has one IP number.

gw0.ru
a records
 
+ 88.151.116.7 88.151.116.0/23 AS39596  
+ ---  
ns-soa records
ns0.ns0.ru
+ 88.151.113.5 88.151.113.0/24 AS17025  
+ ---  
ns records
ns0.ns0.ru
+ 88.151.113.5 88.151.113.0/24 AS17025  
+ ---  
ns1.ns0.ru
+ 88.151.116.5 88.151.116.0/23 AS39596  
mx records
mail.ru.gw0.ru
+ 88.151.116.4 88.151.116.0/23 AS39596 -
+ --- -
subdomains
mail-relay2.ru.gw0.ru
mail.ru.gw0.ru
neptune.ru.gw0.ru
pluto.ru.gw0.ru
sun.ru.gw0.ru
uranus.ru.gw0.ru