jemurray@dsg:~ $ host unixhosts.us
unixhosts.us has address 173.230.136.108
unixhosts.us has IPv6 address 2600:3c02::f03c:91ff:fe93:8906
unixhosts.us mail is handled by 10 mx0.unixhosts.us.

jemurray@dsg:~ $ host 173.230.136.108
108.136.230.173.in-addr.arpa domain name pointer unixhosts.us.