Serial number of the device in ZDM ?

OK, so for meeting room i found out myself :
- For DTEN, Neat board : it's already in ZDM

- for other windows devices : you have the IP address, so you can do a nslookup of the IP, and then with the hostname you do this powershell command : 
Get-WmiObject -ComputerName XXXXXXXXXXXXX -Class Win32_BIOS |select SerialNumber

Now I am looking for the same info for iPads...