Mobile device management settings in Apple Configurator
You can create references to mobile device management (MDM) servers, which your iPhone, iPad, and Apple TV devices contact for enrollment in MDM. From the Apple Configurator 
menu, choose Settings > Servers. You’ll need the following information:
Description: A name for the server, which may be based on location, grade level, or something else easy for you to remember.
Enrollment URL: The fully qualified domain name (FQDN) or IP address of your MDM server. Apple Configurator attempts to ask the MDM server for the full enrollment URL.
If the default FQDN or IP address doesn’t return the correct information, consult your MDM vendor.