---
title: "Feature: #21638 - Introduced IP locking for IPv6"
manual: "TYPO3 Core Changelog"
version: "main"
permalink: "https://docs.typo3.org/permalink/changelog:feature-21638"
source: "Changelog/10.0/Feature-21638-IntroducedIpLockingForIpv6.rst"
modified: "2026-09-14T09:47:36+00:00"
---

# Feature: #21638 - Introduced IP locking for IPv6

See [forge#21638](https://forge.typo3.org/issues/21638)

## Description

The IP-locking functionality has been extended to support IPv6 now as well.
This security feature enables binding of a user session (Backend or Frontend) to an IP address or a part of it.

The available configuration options with their default values for IP-locking are:

```php
$GLOBALS['TYPO3_CONF_VARS']['FE']['lockIP'] = 2;
$GLOBALS['TYPO3_CONF_VARS']['FE']['lockIPv6'] = 2;

$GLOBALS['TYPO3_CONF_VARS']['BE']['lockIP'] = 4;
$GLOBALS['TYPO3_CONF_VARS']['BE']['lockIPv6'] = 2;
```

The configuration can be changed via the Admin Tools -> Settings menu.
The exact meaning of the numbers used for the configuration are documented there.

Code-wise a separate IpLocker class `\TYPO3\CMS\Core\Authentication\IpLocker` has been added, which takes care of the IP-locking for both IP versions.