IPv6 support (AAAA record)

Whether the host publishes an AAAA record. Optional — visitors on IPv6-only networks otherwise arrive through their carrier gateway.

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An AAAA record publishes the IPv6 address of a host, the way an A record publishes its IPv4 address. A large and growing share of mobile and home connections are IPv6-first; some are IPv6-only and reach IPv4-only sites through their carrier's translation gateway (NAT64), which works but adds a hop and puts the carrier between you and your visitor.

How SiteScan checks

The scan looks up AAAA records for the exact host being scanned (for example www.example.com), not just the bare domain. If at least one exists, the row reads "Present"; otherwise "Missing". Both are neutral or positive — IPv6 is an addition, not a repair, so its absence is never shown as an error.

How to add it

• Many hosts, CDNs and cloud providers assign an IPv6 address on request or by default; add the AAAA record next to the existing A record.
• Make sure the web server actually listens on IPv6 (listen [::]:443 ssl; in nginx) and the firewall allows it. Publishing an AAAA record that does not answer is worse than none: some clients will wait for a timeout before falling back.
• Your TLS certificate covers the name, not the address, so it needs no changes.
• If the site sits behind a CDN, enabling IPv6 there is usually enough.

Related: protocol and HTTP/3.