Error Adding IPv6 Reverse Lookup Zone

My organization was just allocated an IPv6 prefix (2602:fbd9::/36) from ARIN. While I have had no trouble hosting an IPv4 reverse lookup zone with Cloudflare, I’m can’t seem to add my IPv6 zone. Upon attempting to add, I receive an error: is not a registered domain

WHOIS information is valid for the prefix:

Based on the advice at Community Tip - Fixing Code: 1049 is not a registered domain, I’ve configured a temporary nameserver for the zone:

> dig +short @ NS
> dig +short @ SOA 2022011901 300 200 600 300

Even with a valid nameserver, Cloudflare still gives the same error.

Does Cloudflare not support IPv6 reverse lookup zones (only IPv4), or is there something else I need to do to set this up?


I am a bit confused, are you trying to add a domain name to your Cloudflare account, or rather BYOIP?

I see it’s poitned to a CNAME, which resolves to an IPv6 → did you added the dns sub-domain under the DNS tab of Cloudflare dashboard or rather trying to add sub-domain alone?

While naked domain is already using Cloudflare nameservers.

I’m not trying to bring my IP addresses themsevles; instead, I’m trying to add the domain - the reverse DNS lookup zone for my block of IP addresses, where I configure their PTR records. points to a server I control, and I’m temporarily using that server as a nameserver for until Cloudflare takes over. (As you note, is also using Cloudflare for its nameservers.)

I forgot to ask before, but are you on the Enterprise plan?

Enterprise customers who control their own IP prefix(es) can set up reverse zones with PTR records to allow reverse DNS lookups

  • Enterprise customers with an IPv6 address space need to contact their account team or Customer Support to get the IPv6 reverse zone added to their account.

Enterprise customers can only add reverse zones for IPv4 addresses. If you want to add zones for IPv6 addresses, contact Customer Support.

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