InetAddress.getLocalHost().getHostName();

127.0.0.1 localhost
#The following lines are desirable for IPv6 capable hosts
::1 ip6-localhost ip6-loopback
fe00::0 ip6-localnet
ff00::0 ip6-mcastprefix
ff02::1 ip6-allnodes
ff02::2 ip6-allrouters
ff02::3 ip6-allhosts

dig @{nameserver-ip} +noall +answer -x {instance-ip}