IPv6 readiness checker
Know whether IPv6-only networks can reach your site and mail before a customer on such a network tells you.
How it measures
- A and AAAA records are fetched for the name; the zone's NS records and the domain's MX hosts (up to four each) are resolved for AAAA.
- Each AAAA value is classified; non-global addresses are flagged.
Limits
- DNS publication only: whether the servers actually answer over IPv6 is not tested from this location.
- A dual-stack record set with a broken IPv6 path still looks fine here.
Troubleshooting
- AAAA present but IPv6 visitors report errors
- The address is published but the service is not listening or the firewall drops IPv6. Test from an IPv6-enabled network or a monitoring location with IPv6.