IPv6 Website & Compatibility Checker

The IPv6 Website Checker tells you in one click whether a domain is reachable over the modern IPv6 protocol. Enter any domain name and the tool queries its authoritative DNS servers to retrieve AAAA (IPv6) records, reporting whether the website, its name servers, and its mail servers are fully IPv6-ready.

The internet is in the middle of a slow but unmistakable shift from IPv4 to IPv6. IPv4, introduced in 1982, only supports about 4.3 billion unique addresses, and that pool has effectively run out. IPv6, with its 128-bit address space, provides roughly 340 undecillion addresses — enough to assign trillions of IPs to every device on the planet — along with improvements in routing efficiency, built-in security, and end-to-end connectivity.

IPv6 adoption since 2015 (source: Google's public IPv6 statistics)

For a domain to be reachable over IPv6, its DNS zone needs at least one AAAA record pointing to a valid IPv6 address. The AAAA record is the IPv6 equivalent of the familiar A record used for IPv4. Without it, browsers and applications running on IPv6-only networks simply cannot reach the site. The APIFreaks IPv6 Compatibility Checker automates this verification: it performs a live DNS lookup against the domain you provide, parses both A and AAAA records returned by the authoritative nameservers, and gives you a clear yes-or-no verdict on IPv6 support — plus the full record breakdown so you can audit your DNS configuration without dropping into command-line tools like dig or nslookup.

The tool is free, requires no signup, and works for any publicly resolvable domain. Whether you are a website owner verifying that AAAA records you just published have propagated, a sysadmin auditing dozens of domains during an IPv6 migration, or a developer debugging connectivity issues from an IPv6-only client, this checker gives you the information you need in seconds.

What would you get from this tool?

Three things, instantly, for any domain you enter:

A clear IPv6 compatibility verdict — a simple “Yes” or “No” telling you whether the domain has at least one valid AAAA record published in DNS. This is the fastest way to confirm IPv6 readiness without parsing raw DNS output.

A deep-dive check that verifies AAAA records across three critical layers: the website domain, the authoritative name servers, and the MX (mail) infrastructure.

A full list of AAAA records — every IPv6 address associated with the domain. When the verdict is Yes this section shows you the actual IPv6 endpoints serving the site. When it is No, the section will be empty, which itself is the diagnostic answer. For programmatic access at scale, the same lookups can be powered by the APIFreaks DNS Lookup API

How can you use this tool?

Use the checker in this order to go from raw domain name to a complete IPv6-readiness audit:

Enter the domain you want to test: Type the bare hostname, such as apifreaks.com, into the Enter Domain field. Do not include http://, https://, paths, or query strings. Subdomains like api.example.com also work, but they are checked independently from the root domain.
Run the lookup: Click Check IPv6 Compatibility. The tool queries live DNS data for the domain, then checks whether valid AAAA records exist and whether related infrastructure also supports IPv6.
Read the main verdict first: Start with the IPv6 Compatible field at the top of the response. A result of Yes means the domain has at least one published AAAA record and is reachable over IPv6. A result of No means the domain currently resolves over IPv4 only.
Inspect the AAAA Records section: This table lists the IPv6 addresses published directly for the domain. In a result like apifreaks.com, multiple AAAA records usually indicate load balancing, CDN routing, or multiple serving endpoints.
Check the Name Server Test section: Review whether the domain’s authoritative name servers also have IPv6 addresses. IPv6-capable name servers matter because IPv6-only clients and resolvers can run into DNS problems if the NS layer remains IPv4-only.
Check the Mail Server Test section: Look at whether the domain’s MX targets publish AAAA records. If the mail servers support IPv6, inbound and outbound email delivery is more reliable for IPv6-capable or IPv6-only networks.
Use the combined result as an IPv6 readiness check: A strong result is not just a Yes verdict for the website itself, but also IPv6 support across the domain records, name servers, and mail servers. That gives you a more complete picture of whether the domain is genuinely ready for IPv6 traffic.

Use Cases

Verifying Your Own IPv6 Rollout

If you have just added AAAA records to your DNS zone, this tool confirms they have propagated and resolve correctly from the public internet. It is faster and friendlier than running dig AAAA yourdomain.com from a terminal.

Auditing Client or Vendor Domains

Agencies, hosting providers, and consultants can quickly check whether the domains they manage are IPv6-ready as part of routine DNS health audits, before recommending migration work to clients.

Debugging Connectivity Issues

If users on mobile carriers or IPv6-only networks report that they cannot reach a site, the first diagnostic step is confirming whether the domain even publishes AAAA records. This tool gives you that answer immediately.

Competitor and Industry Research

SEO specialists, infrastructure researchers, and journalists tracking IPv6 adoption can sample domains across an industry to see who has migrated and who has not.

Pre-launch Checks for New Sites

Before going live with a new domain, verify that both A and AAAA records are in place so the site is reachable for the broadest possible audience from day one.

Compliance and Procurement

Government agencies and large enterprises increasingly require IPv6 support from vendors. Procurement and compliance teams can use this tool to verify that supplier domains meet that requirement.

Education and Training

Students and networking trainees learning how DNS and IP addressing work can use the tool as a hands-on way to inspect real-world DNS records without installing additional software.

FAQs

It means the domain has at least one AAAA record published in its DNS zone, pointing to a valid IPv6 address. That allows browsers and applications on IPv6 networks to connect to the site directly over IPv6 instead of falling back to IPv4.

An A record maps a domain name to a 32-bit IPv4 address (for example, 93.184.216.34). An AAAA record maps the same domain to a 128-bit IPv6 address (for example, 2606:2800:220:1:248:1893:25c8:1946). A domain can have both, and most modern websites do.

No. It means your website is reachable over IPv4 only. Visitors on dual-stack networks (which still represent the majority of internet users) will reach you without any issue. However, users on IPv6-only mobile networks or corporate VPNs may experience problems, and search engines increasingly favor IPv6-ready sites. Adding AAAA records is recommended.

You need two things: an IPv6 address from your hosting provider or CDN, and an AAAA record in your DNS zone pointing your domain to that address. Most major hosts (Cloudflare, AWS, Google Cloud, DigitalOcean) offer IPv6 by default. Once the AAAA record is published, return to this tool to confirm propagation.

Large sites and services use multiple records for load balancing, redundancy, and CDN edge distribution. Each record represents a different server that can answer requests for that hostname.

This tool checks DNS records — specifically whether AAAA records exist and resolve properly. It does not test whether the IPv6 endpoint is actually responding to traffic. For an end-to-end connectivity test, you would need to ping or curl the IPv6 address directly.

Yes. The same DNS and IP data that powers this checker is available through the APIFreaks DNS Lookup API, which lets you query A, AAAA, and other DNS records programmatically and integrate IPv6 verification into your own applications, monitoring systems, or CI pipelines.

Yes. The web tool is free to use with no signup required and no daily limit for normal interactive use.

Yes. You can check any fully qualified domain name, including subdomains like mail.example.com or api.example.com. Each hostname is queried independently.

Many high-profile domains, including some used in documentation, do not yet publish AAAA records. The “No” result reflects the actual state of their DNS zone, not a tool error.

We also offer

Domain Age Checker

Bulk Domain to IP Lookup

SSL Certificate Finder

HSTS Checker

DNSSEC Checker

ASN Lookup

VPN & Proxy IP Detection

User Agent Parser

Explore more tools available on our platform.

IPv6 Website & Compatibility Checker

How can you use this tool?

Use the checker in this order to go from raw domain name to a complete IPv6-readiness audit:

Enter the domain you want to test: Type the bare hostname, such as apifreaks.com, into the Enter Domain field. Do not include http://, https://, paths, or query strings. Subdomains like api.example.com also work, but they are checked independently from the root domain.

Run the lookup: Click Check IPv6 Compatibility. The tool queries live DNS data for the domain, then checks whether valid AAAA records exist and whether related infrastructure also supports IPv6.

Read the main verdict first: Start with the IPv6 Compatible field at the top of the response. A result of Yes means the domain has at least one published AAAA record and is reachable over IPv6. A result of No means the domain currently resolves over IPv4 only.

Inspect the AAAA Records section: This table lists the IPv6 addresses published directly for the domain. In a result like apifreaks.com, multiple AAAA records usually indicate load balancing, CDN routing, or multiple serving endpoints.

Check the Name Server Test section: Review whether the domain’s authoritative name servers also have IPv6 addresses. IPv6-capable name servers matter because IPv6-only clients and resolvers can run into DNS problems if the NS layer remains IPv4-only.

Check the Mail Server Test section: Look at whether the domain’s MX targets publish AAAA records. If the mail servers support IPv6, inbound and outbound email delivery is more reliable for IPv6-capable or IPv6-only networks.

Use the combined result as an IPv6 readiness check: A strong result is not just a Yes verdict for the website itself, but also IPv6 support across the domain records, name servers, and mail servers. That gives you a more complete picture of whether the domain is genuinely ready for IPv6 traffic.