ANNOUNCEMENT: community.oracle.com is currently Read only due to planned upgrade until 28-Sep-2020 9:30 AM Pacific Time. Any changes made during Read only mode will be lost and will need to be re-entered when the application is back read/write.
The service does not assign IP addresses to your hostnames. These are the update clients you are using. You must fix these update clients, so that they update only the hostnames they are responsible for and with the correct IP address.