> For the complete documentation index, see [llms.txt](https://docs.ngsurvey.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.ngsurvey.com/form-management/security/security-items/ip-access-control.md).

# IP Access Control

## What is IP access control ?

The IP security item will restrict access to the form based on the respondent IP.

{% 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 Access control properties

* **`IP`**is the IP that should be either allowed or denied access to the survey. IP masks using \* within the IP are fully supported.


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