Has an IPv4 address but no IPv6 (AAAA) record. IPv6-only visitors can't reach it directly.
Measured 2026-11-13 16:07 UTC. We reuse a result for up to a week, so we aren't testing the same site over and over. Check carioca.rio now
D
IPv6 readiness
The website has no IPv6.
Website over IPv6 carioca.rio has no AAAA record.
no
www over IPv6 www.carioca.rio has no AAAA record.
no
Mail servers (MX) have IPv6 None of the mail servers has an AAAA record.
mx1.rio.rj.gov.br ✗
no
Nameservers have IPv6 No nameserver has an AAAA record — an IPv6-only resolver can't reach this domain's DNS.
ns1.rio.rj.gov.br ✗ns0.rio.gov.br ✗
no
First measured 2026-11-04; last confirmed 2026-11-13.
What's keeping carioca.rio from an A
Give carioca.rio an IPv6 address Ask your hosting provider for the site's IPv6 address (or the hostname to point at), then publish it as an AAAA record. If your host doesn't offer IPv6, a proxy that does can sit in front. How to add an AAAA record
www.carioca.rio is an alias of carioca.rio, which has no IPv6 www.carioca.rio is a CNAME, so it can't also have its own AAAA record. Ask whoever runs carioca.rio to enable IPv6 there — or replace the alias with the A and AAAA records they give you. Why some hosts don't offer IPv6
Mail servers without IPv6 mx1.rio.rj.gov.br 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.
Nameservers without IPv6 ns1.rio.rj.gov.br, ns0.rio.gov.br all have no AAAA record, so a resolver that only speaks IPv6 can't look your domain up. Most DNS providers offer IPv6 nameservers; ask yours, or move DNS to one that does.
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
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