IPv6 Compatibility Checker

Check whether a website supports IPv6 for its web, mail and DNS servers.

Continue your work

DNS Lookup — See the AAAA records directly.
IPv6 Subnet Calculator — Plan IPv6 addressing for your network.

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Clear instructions

Find steps, examples and limitations below.

Use online

Open the tool in a supported web browser.

Free to use

No sign-up required. Tool-specific limits may apply.

How to use the IPv6 Compatibility Checker

Check whether a website supports IPv6 for its web, mail and DNS servers.

1 Enter the domain name.
2 Click Check IPv6.
3 See which services have IPv6 addresses and which are IPv4 only.

Example and practical tips

google.com scores 100% because its website, nameservers and mail servers all have AAAA records. A site with only IPv4 web servers cannot be reached by IPv6-only networks without translation.

Frequently asked questions

What is an AAAA record?

The DNS record that holds an IPv6 address, just as an A record holds an IPv4 address.

Does this test my own connection?

No. It checks the domain’s DNS records. Your own connection’s IPv6 support is shown by your IP address tools.