Hi Ruth,
Depending on the EXOS version that shipped on your X440, once the mgmt port is connected to a network that provides an address via DHCP, the full IP address will flash in the stacking LCD window on the left side of the switch. Chalet and "Zero-Touch Provisioning" is in EXOS 15.7+. Previous EXOS versions have a similar auto-provisioning feature, but it requires more configuration.
Here's some more information on how
Zero Touch Provisioning works.
If there is no DHCP server,
take a look at this thread, which will explain how the Link Local addressing works (based on switch MAC address).
-Drew