# IP Protection

## 💻 What is IP protection ?

The IP security item will protect our form against multiple submissions by recording the IP of the respondent and not allow him to fill the form a second time after he submits his answers.

{% hint style="info" %}
ngSurvey will read the forwarded IP if respondents is behind a firewall or proxy. 
{% endhint %}

{% hint style="warning" %}
Some respondents behind corporate firewalls or proxies might have the same IP address. ngSurvey does its very best to get the real IP but depending on the mode activated on the firewalls or proxies it is sometime impossible to get a unique IP per respondent.
{% endhint %}

## 🔅 IP Protection properties

* **`IP Expires after`** is the number of minutes after a respondent IP that was recorded will be allowed to submit answers again .


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