IPv6 compatibility

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

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

Availability

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

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.

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 disable IPv6 Compatibility in the dashboard:

1. Log in to your Cloudflare account ↗ and go to a specific domain.
2. Go to Network.
3. For IPv6 Compatibility, switch the toggle to Off.

API

To disable IPv6 Compatibility with 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 can still receive IPv6 traffic via the Tor network. To completely disable all IPv6 traffic:

• Disable 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, and
• confirmation of whether disabling IPv6 Compatibility resolves the issue.