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# Filter by IP

If you want to run internal tests from your office/site IP addresses, you can filter out requests originating from a specific IP address.

**TO define an IP address you want to filter:**

1. Open the **PX_CUSTOM.vcl** fie.
2. Add the required IP as a regex expression using req.http.Fastly-Client-IP.

**EXAMPLE**

```javascript
sub px_custom_filter_by_ip {
   if (req.http.Fastly-Client-IP ~ {"<filterd_ip_address_regex>"}) {
      set req.http.X-PX-filter-by:ip = "1";
   }
}
```

To learn more about custom subroutines, see [Customized subroutines](https://portal.document360.io/pxconsole/docs/configuration-options-1#customized-subroutines).

**TO enable the feature:**

1. Open the **PX_CONFIG.vcl** file.
2. Set the px_filter_by_ip_enabled value to "true" (enabled). The default is "false" (disabled).

```javascript
table px_configs {
  "px_filter_by_ip_enabled": "true",
}
```

> **Test**
>
> 1. Send a request that includes the filtered IP.
> 2. Openthe console and search for your request. If you can't find the request, the feature is configured correctly.