go
server.youporn.com.au has one IP number , which is the same as for youporn.com.au. youporn.com.au, www.youporn.com.au and ns1.youporn.com.au point to the same IP. youporn.com.au is a domain controlled by two nameservers at youporn.com.au themselves. They are on different IP networks. Incoming mail for youporn.com.au is handled by one mailserver at com.au. server.youporn.com.au is hosted on a server in United States even though the hostname implies Australia.

server.youporn.com.au
a records
 
+ 66.90.104.92 66.90.64.0/18 AS30058  
+ ---  

youporn.com.au
a records
 
+ 66.90.104.92 66.90.64.0/18 AS30058  
+ ---  
ns-soa records
ns1.youporn.com.au
+ 66.90.104.92 66.90.64.0/18 AS30058  
+ ---  
ns records
ns1.youporn.com.au
+ 66.90.104.92 66.90.64.0/18 AS30058  
+ ---  
ns2.youporn.com.au
+ 67.159.23.250 67.159.0.0/18 AS30058  
mx records
youporn.com.au
+ 66.90.104.92 66.90.64.0/18 AS30058  
+ ---  
ip numbers of host
66.90.104.92
hostnames sharing ip with a-records
ns1.youporn.com.au
www.youporn.com.au
youporn.com.au
domains using this as nameserver under another name
youporn.com.au
domains using this as mailserver under another name
youporn.com.au