IP v4 address block 172.16.0.0/12 is a private, non-routable address range. Adding any address within that range should pass the overlap checks. However, attempting to add such causes a complaint about overlap then a command failure.
Notice the error message. Command failure.
There should be no conflicts with arin addresses reported when creating reverse ip zones for any RFC1918 subnet.
$ rpm -q freeipa-server freeipa-client ipa-server ipa-client 389-ds-base pki-ca krb5-server
package ipa-server is not installed
package ipa-client is not installed
Any additional information, configuration, data or log snippets that is needed for reproduction or investigation of the issue.
Log file locations: https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/Linux_Domain_Identity_Authentication_and_Policy_Guide/config-files-logs.html
Troubleshooting guide: https://www.freeipa.org/page/Troubleshooting
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