dig : DNS lookup utility
[SYNOPSIS] dig OPTION HOSTNAME / IP ADDRESS
OPTION
Forward lookup
# dig google.com
-x
Reverse lookup
# dig -x 111.222.333.444
-p PORT
Specify PORT
# dig -p 5354 node01.server.education.
Specify the DNS server to send queries to
# dig @network.srv.world node01.server.education.