Is a domain ready for IPv6? AAAA records for its website, mail servers and name servers
Runs in your browser. Only the lookup you start is sent to cloudflare-dns.com or dns.google; nothing else leaves your device. Checked against sources on 16 Oct 2026.An IPv6 readiness checker looks up whether a domain publishes IPv6 addresses where they matter. This one asks a public DNS resolver from your browser for the AAAA records of the domain and its www name, of each mail server in its MX records and of each name server, then reports which of website, email and DNS are ready.
Type the domain or an email address at it.
Press Look up.
Read the three areas and the addresses of each host.
A device on an IPv6-only network, which many mobile networks now are, can reach a site directly only if the site publishes an IPv6 address. DNS publishes it in an AAAA record, as RFC 3596 defines. This checker looks for AAAA records in the three places that decide whether a domain works for such devices:
www name. If both exist and only one has IPv6, visitors reach one and not the other.The headline counts how many of the three areas are ready. Each host's IPv4 and IPv6 addresses are listed, so a missing record is easy to spot.
An AAAA record can be worse than none. An address such as ::1 (loopback), fe80:: (link-local), fd00:: (private, RFC 4193), ::ffff: (IPv4-mapped) or 2001:db8:: (documentation, RFC 3849) cannot be reached over the internet, and a device that tries it first may wait for a timeout. Each one is flagged with the reason.
The lookups go from your browser to the resolver you choose, Cloudflare or Google, over DNS-over-HTTPS; the domain is sent to that resolver and nowhere else. Our server is not involved. An AAAA record shows that IPv6 is published; whether the server then answers over IPv6 is not tested.
Type the domain and press Look up. The checker asks a public DNS resolver for the AAAA records of the domain and of its www name. An AAAA record holds an IPv6 address, so a site with one on both names is reachable by IPv6-only visitors; one with none is IPv4 only.
An AAAA record is the DNS record that maps a name to an IPv6 address, defined in RFC 3596, in the same way an A record maps a name to an IPv4 address. A name can have both. Devices with IPv6 usually try the AAAA address first and fall back to the A address.
Email is delivered to the servers named in the domain's MX records, which are often on another provider's names. A website can have IPv6 while its mail servers do not. The checker looks up the AAAA records of the first four mail servers, in priority order, and reports how many have IPv6.
The record holds an address that cannot be reached over the internet, such as ::1, a link-local fe80:: address, a private fd00:: address, an IPv4-mapped ::ffff: address or the 2001:db8:: documentation range. Devices may try it first and wait for a timeout, so it is worse than no record.
No. It reads DNS only, so it shows whether IPv6 is published, not whether the address then answers. A firewall or a server that is not listening on IPv6 can still fail. The page says so under the results, and the Ping Test can check an IPv6 address from our server where its route allows.
Only the DNS resolver you choose, Cloudflare or Google. Your browser sends the lookups to it directly over DNS-over-HTTPS; our server is not involved and logs nothing. Changing the resolver repeats the lookups through the other one.
Rates and rules change; check the source before you rely on a figure.
Still stuck? Ask about IPv6 Readiness Checker and anybody who knows can answer. No account needed.
Same job, other tools: AAAA Record Lookup (IPv6) – Check whether a domain has an IPv6 address, and what it is · NS Lookup – Find the name servers a domain is delegated to, and how long resolvers cache them · DS Record Lookup – Read the DS record the parent zone holds and see whether it matches a published key · Domain Expiry Checker – Domain expiry check: the registry’s own expiry date, with the days left counted · DNSKEY Lookup – List a zone’s DNSKEY records with key tags, KSK or ZSK roles, algorithms and key sizes.