IPv6 compatibility

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 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. Client software will determine whether to use IPv4 or IPv6 to connect to a hostname that supports both methods.

For proxied DNS records that have both an IPv6 and IPv4 origin address, Cloudflare will prefer the IPv4 address when connecting to your origin server.

Availability

	Free	Pro	Business	Enterprise
Availability	Yes	Yes	Yes	Yes
Can customize	No	No	No	Yes

Enable IPv6 compatibility

By default, IPv6 compatibility is turned on for your domain and will apply to all domains and subdomains covered by proxied DNS records.

Note

If you have signed up for Cloudflare through a Cloudflare hosting partner ↗ or by use partial setup, IPv6 compatibility does not apply to your apex domain.

Disable IPv6 compatibility

If your origin web server only understands IPv4 formatted IP addresses, non-Enterprise customers should enable Pseudo IPv4.

Alternatively, customers with an Enterprise account can disable Cloudflare's IPv6 compatibility.

Dashboard

To turn off IPv6 compatibility in the dashboard:

1. Log in to your Cloudflare account ↗ and go to a specific domain.
2. Go to Network.
3. Turn off IPv6 Compatibility.

API

To disable IPv6 compatibility using the API, send a PATCH request with ipv6 as the setting name in the URI path, and the value parameter set to "off".

Note

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

• Turn off Onion Routing.
• Use a WAF custom rule to block 0:0:0:0:0:0:0:0/0 using the filter ip.src in {::/0}.

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Troubleshoot an IPv6 network issue

Provide the following information to Cloudflare Support if you experience issues with IPv6 connectivity:

• A traceroute that demonstrates the IPv6 connection issues.
• The Cloudflare data center serving your request when the IPv6 issues occur.
• Confirmation of whether disabling IPv6 Compatibility resolves the issue.