There are quite a few situations where you can benefit from capturing a visitor's IP address.
It's possible to capture this information from a service that can collect the visitor's public IP, and resolve that to key lookup information such as location.
See what some public IP info services provide;
Of course, seeing IP data isn't useful by itself. Storing it with information that the user sent is much more important.
Let's demonstrate how to do that;
Automatically captures the visitor's IP info and appends it to the form as hidden fields. Will be captured by the form submitter.
See the designer view of this demonstration by clicking the button at the top.
Then view this part of the layout for details;