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[Network] Update IPv6 compatibility #23783

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Jul 18, 2025
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[Network] Update IPv6 compatibility #23783

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26 changes: 13 additions & 13 deletions src/content/docs/network/ipv6-compatibility.mdx
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Original file line number Diff line number Diff line change
Expand Up @@ -8,6 +8,8 @@ import { FeatureTable, TabItem, Tabs } from "~/components";

Cloudflare enables IPv6 on all domains without requiring additional configuration or hardware (as long as your host provides IPv6 support).

When IPv6 compatibility is turned on, Cloudflare auto generates [`AAAA` DNS records](/dns/manage-dns-records/reference/dns-record-types/#a-and-aaaa) to allow IPv6 clients to connect. On the other hand, when IPv6 compatibility is turned off, Cloudflare does not automatically generate and advertise `AAAA` DNS for the zone.

When both IPv4 and IPv6 connections are available, Cloudflare prefers IPv4.

## Availability
Expand All @@ -16,12 +18,10 @@ When both IPv4 and IPv6 connections are available, Cloudflare prefers IPv4.

## Enable IPv6 compatibility

By default, IPv6 compatibility is enabled on your domain and will apply to all domains and subdomains covered by [proxied DNS records](/dns/proxy-status/).
By default, IPv6 compatibility is turned on for your domain and will apply to all domains and subdomains covered by [proxied DNS records](/dns/proxy-status/).

:::note

If you have signed up for Cloudflare through a [Cloudflare hosting partner](http://www.cloudflare.com/hosting-partners) or by use [partial setup](/dns/zone-setups/partial-setup/), IPv6 compatibility does not apply to your apex domain.

:::

## Disable IPv6 compatibility
Expand All @@ -32,23 +32,23 @@ Alternatively, customers with an Enterprise account can disable Cloudflare's IPv

<Tabs syncKey="dashPlusAPI"> <TabItem label="Dashboard">

To disable **IPv6 Compatibility** in the dashboard:
To turn off IPv6 compatibility in the dashboard:

1. Log in to your [Cloudflare account](https://dash.cloudflare.com) and go to a specific domain.
2. Go to **Network**.
3. For **IPv6 Compatibility**, switch the toggle to **Off**.
2. Go to **Network**.
3. Turn off **IPv6 Compatibility**.

</TabItem> <TabItem label="API">

To disable **IPv6 Compatibility** with the API, send a [`PATCH`](/api/resources/zones/subresources/settings/methods/edit/) request with `ipv6` as the setting name in the URI path, and the `value` parameter set to `"off"`.
To disable IPv6 compatibility using the API, send a [`PATCH`](/api/resources/zones/subresources/settings/methods/edit/) request with `ipv6` as the setting name in the URI path, and the `value` parameter set to `"off"`.

</TabItem> </Tabs>

:::note

Even when IPv6 is disabled, domains can still receive IPv6 traffic via the Tor network. To completely disable all IPv6 traffic:
Even when IPv6 is disabled, domains may still receive IPv6 traffic (for example, via the Tor network). To completely disable all IPv6 traffic:

- Disable [**Onion Routing**](/network/onion-routing/).
- Turn off [**Onion Routing**](/network/onion-routing/).
- Use a [WAF custom rule](/waf/custom-rules/create-dashboard/) to block `0:0:0:0:0:0:0:0/0` using the filter `ip.src in {::/0}`.

:::
Expand All @@ -57,8 +57,8 @@ Even when IPv6 is disabled, domains can still receive IPv6 traffic via the Tor

## Troubleshoot an IPv6 network issue

Provide the following information to [Cloudflare Support](/support/contacting-cloudflare-support/) if you experience issues with IPv6 connectivity:
Provide the following information to [Cloudflare Support](/support/contacting-cloudflare-support/) if you experience issues with IPv6 connectivity:

- A [traceroute](/support/troubleshooting/general-troubleshooting/gathering-information-for-troubleshooting-sites/#perform-a-traceroute) that demonstrates the IPv6 connection issues,
- the [Cloudflare data center serving your request](/support/troubleshooting/general-troubleshooting/gathering-information-for-troubleshooting-sites/#identify-the-cloudflare-data-center-serving-your-request) when the IPv6 issues occur, and
- confirmation of whether [disabling IPv6 Compatibility](#disable-ipv6-compatibility) resolves the issue.
- A [traceroute](/support/troubleshooting/general-troubleshooting/gathering-information-for-troubleshooting-sites/#perform-a-traceroute) that demonstrates the IPv6 connection issues.
- The [Cloudflare data center serving your request](/support/troubleshooting/general-troubleshooting/gathering-information-for-troubleshooting-sites/#identify-the-cloudflare-data-center-serving-your-request) when the IPv6 issues occur.
- Confirmation of whether [disabling IPv6 Compatibility](#disable-ipv6-compatibility) resolves the issue.