This Add-one is useful for spam prevention, you can set a limit to the Gravity Forms submissions by visitor's IP address over a custom time range.

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The Gravity Forms IP Limit Add-On allows you to restrict how many times a user can submit a form based on their IP address, within a specified number of days.
Features:
<ul>
<li>Enable or disable IP limiting per form.</li>
<li>Set a custom number of days to look back.</li>
<li>Set the maximum number of submissions allowed from the same IP in that period.</li>
<li>Adds a validation error if the IP has already submitted too many times.</li>
</ul>
Perfect for: 
* Preventing form abuse/spam 
* Limiting contact form submissions

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