Has an IPv4 address but no IPv6 (AAAA) record. IPv6-only visitors can't reach it directly.
D
IPv6 readiness
The website has no IPv6.
Website over IPv6 support.cookiebot.com has no AAAA record.
no
www over IPv6 www.support.cookiebot.com has no AAAA record.
no
Mail servers (MX) have IPv6 None of the mail servers has an AAAA record.
mail-pod-28.int.zendesk.com ✗
no
Nameservers have IPv6 2 of 2 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up.
kiki.ns.cloudflare.com ✓keanu.ns.cloudflare.com ✓
yes
What's keeping support.cookiebot.com from an A
support.cookiebot.com is an alias of cookiebot.zendesk.com, which has no IPv6 support.cookiebot.com is a CNAME, so it can't also have its own AAAA record. Ask whoever runs cookiebot.zendesk.com to enable IPv6 there — or replace the alias with the A and AAAA records they give you. Why some hosts don't offer IPv6
Add IPv6 for www.support.cookiebot.com www.support.cookiebot.com has no AAAA record. Get www's IPv6 address from whoever hosts www and add it as an AAAA record. If the same server already serves both names (and its certificate covers www), you can reuse support.cookiebot.com's AAAA record(s) for www. How to add an AAAA record
Mail servers without IPv6 mail-pod-28.int.zendesk.com has no AAAA record, so mail from IPv6-only servers can't reach it directly. If a provider runs your mail, that's their setting; if you run it, add AAAA records for these hosts.
Visitors on IPv6-only networks (many mobile carriers) can still reach it, but only through a translator their carrier runs (NAT64). The site itself has no IPv6 address — and you can't make one up from the IPv4. Why some hosts don't offer it
Copy the evidence— a citation-ready record of this measurement