How do i get Ipad ip address from C# Applicaiton

I am developing asp.net MVC web application (FrontOffice Kiosk) which is going to install in the several IPAD. So that user can go and submit their requests.

I know how to get system IP Address but I want to know if my application installed 5 iPad with different location . I would like track the request along with which iPAD.

asp.net mvc

ipad #1 -> need ipaddress (xx)
ipad #2 ->need ipaddress (yy)
Ipad #3 -> need ipaddress (zz)