BIND Utilities is a collection of the client side programs that are included with BIND. The BIND package includes the client side programs nslookup, dig and host. If you install BIND server, these programs will be installed automatically. In the situation when you are not looking on having the BIND server installed, but you would like to install the client side applications (dig, host, and nslookup) this can be done by installing only the bind-utils package:

$ host
-bash: host: command not found

$ dig
-bash: dig: command not found

$ nslooup
-bash: nslookup: command not found

yum install bind-utils

$ dig -v
DiG 9.7.3-P3-RedHat-9.7.3-2.el6_1.P3.3