Get computer specific IP address or subnetmask

Hello,

I am trying to create a computer sign-in option for teachers within my school building.  I have created a form with a name field as well as un-editable time and date.  However, I would like to record their actual IP address or subnet mask rather than the IP address of the ISP to ensure they are signing in from the building.  Is this possible?  Our ISP provides internet to all the school districts in the county.  The IP shown in the reports is in the location of the ISP.  

Dean

It should be possible to do so with this widget: https://widgets.jotform.com/widget/get_visitor_location

But I'm afraid that that widget will pick up public IP as well, I'm not sure if it is possible to pick up local IP with it.

And that is what you want right?

I'm sorry, just to confirm, it is possible to get only public IP with the widget I provided: https://widgets.jotform.com/widget/get_visitor_location.