Getting the IP Address of end user

Hi

We have a custom ap with make.
We came across a situation where a user from make was creating a trial account with us and using until a trial limit is reached as soon as trial limit is reached he creates a new account and do the same. user did around 25 times in very short period of time. Would it be possible to get the some more information about the user so we can identify that its same user in Make. Some kind of header which can idendify the user?

Thanks

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