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Description of problem: In https://access.redhat.com/site/documentation/en-US/OpenShift_Enterprise/2/html/Deployment_Guide/Configuring_Sub-domain_Hostname_Resolution.html as well as OpenShift Enterprise's openshift.sh the "IN" record class is missing. Bind apparently defaults to using the "IN" class since it is the only class used on the internet. However, to avoid confusion we should follow best practices.