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You will be able to get the IP of who submits the form by following the steps on this guide: https://www.jotform.com/help/31-How-to-See-IP-Addresses-of-Form-Submitters.
What are you trying to achieve once you have verified the IP address?
Are you trying to limit the number of submissions per IP?
I think that this would be better done by enabled unique submissions on your form, you will need to click on the Preferences icon while you are in the Form Builder:
Once there you will need to click on the Advanced tab and then select an option no the Unique Submission section:
There is a difference between strict and loose check.
Loose Check controls the cookie.
Strict Check also controls the IP address.
If you select Strict Check, people in the same network (in the same school, college,university, institution ) will not be able to make submissions, as the IP address for the network would be the same. If you are considering the target audience as students in the same school, Loose Check should be chosen.
Hope this helps.
Your question is moved to a separate thread and shall be answered shortly.