# Security zone with IP addresses

**URL:** <https://forum.inductiveautomation.com/t/security-zone-with-ip-addresses/56899>\
**Category:** Ignition\
**Tags:** security, ignition81\
**Created:** [March 7, 2022, 11:00am UTC](https://forum.inductiveautomation.com/t/security-zone-with-ip-addresses/56899 "2022-03-07T11:00:53Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![nminchin](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/nminchin/32/6911_2.png) [@nminchin](https://forum.inductiveautomation.com/u/nminchin)\
**Post date:** [March 7, 2022, 11:40am UTC](https://forum.inductiveautomation.com/t/security-zone-with-ip-addresses/56899/2 "2022-03-07T11:40:19Z")

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In your Perspective client, what is the value of `session.props.host`? This is what is used for the IP address filtering.

This is for 8.1.5 at least, I have a feeling it's changed in later versions as I think hostnames are actually supported now with reverse DNS.

This is what I was talking about, 8.1.10 (8.1.9 was canned)

> [@Perspective - Scripting - Get Computer name and IP of client](https://forum.inductiveautomation.com/t/perspective-scripting-get-computer-name-and-ip-of-client/49626/5):
>
> In 8.1.9 you’ll be able to opt-in to a setting on the gateway that has the gateway do a reverse DNS lookup to attempt to verify the hostname based on the provided IP: “When enabled, Ignition’s web server will attempt to resolve the remote HTTP client’s hostname by performing a reverse DNS lookup using the remote HTTP client’s IP address where appropriate, which could have a performance impact for each request which attempts a hostname lookup. When disabled, Ignition’s web server will not attem…

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