How to install dig on CentOS 7

You must install bind-utils if you need to get information from DNS name servers.

$ sudo yum install bind-utils

The syntax is:

dig Hostname
dig DomaiNameHere
dig @DNS-server-name Hostname
dig @DNS-server-name IPAddress
dig @DNS-server-name Hostname|IPAddress type

For example:

$ dig rdb24.com
$ dig @8.8.8.8 rdb24.com
$ dig @8.8.8.8 MX rdb24.com
$ dig @8.8.8.8 AAAA rdb24.com