Question 1

What is an IPv6 Compatibility Checker?

Accepted Answer

An IPv6 Compatibility Checker reviews whether a domain is set up to work on the IPv6 network. It looks at the details that make IPv6 communication possible, mainly the presence of IPv6 DNS records like AAAA entries, and checks if the domain responds when reached through IPv6.

As the internet continues to move toward IPv6, an IPv6 tester provides a clear way to assess a domain’s IPv6 compatibility. It shows whether the IPv6 address is correctly published and whether the domain can be reached using that newer protocol.

The idea behind an IPv6 compatibility checker is simple. It provides an accurate status of a domain’s IPv6 setup and flags any missing or incomplete components based on standard DNS and networking behavior.

Question 2

Do DNS records (AAAA or CNAME) affect IPv6 access to a site?

Accepted Answer

Yes, DNS records play a significant role in how a site appears on IPv6. The key record for IPv6 is the AAAA record. This record links your domain name to an IPv6 address. Without an AAAA record, an IPv6-only device has nothing to connect to, so the site will not load over IPv6. A CNAME record can also influence IPv6 access. When a domain uses a CNAME, the lookup is passed to another domain. That second domain must have a working AAAA record of its own, or the chain breaks. Even if your main domain looks fine, missing or incorrect IPv6 records on the target of a CNAME can still block IPv6 access. In simple terms, IPv6 depends on what your DNS is publishing. If the AAAA record is missing, incorrect, or buried behind a CNAME that does not have IPv6, the site will not appear on IPv6 networks. This is why checking DNS is often the first step when reviewing IPv6 compatibility.

Question 3

Do proxies support IPv6 and does that affect how I reach websites or services?

Accepted Answer

Proxies can support IPv6, but this depends on how they are configured. Some proxy networks support both IPv4 and IPv6, while others support only IPv4 unless IPv6 is explicitly enabled. When a proxy supports IPv6, your requests are sent using an IPv6 address, so the websites or services you visit treat the traffic as IPv6. Different types of proxies handle this in various ways. Residential proxies rely on the networks of real households, so IPv6 availability depends on whether those networks provide IPv6.  IPv6 support can affect your access, as not every website supports it. If the proxy sends IPv6 traffic to a site that only supports IPv4, the proxy must fall back to IPv4, or the connection will fail. This is why checking IPv6 compatibility is helpful. It gives you a clear idea of how your proxy traffic will appear and whether it can connect over IPv6 when needed.

Question 4

If I add an IPv6 address, why might users still be unable to reach my site?

Accepted Answer

Adding an IPv6 address is only one part of making a site reachable on IPv6. The server also needs to accept IPv6 traffic. If the server is configured to listen only on IPv4, the IPv6 address in DNS will not help, because nothing is responding on the IPv6 side. Another common reason is filtering. Many hosting panels, cloud platforms, and firewalls handle IPv6 separately from IPv4. If IPv6 ports are blocked or not opened, visitors will see a failure even though the AAAA record looks correct. This is often the point where IPv6 breaks without the user realizing it. There is also the network around the server. Some routes may not be advertised correctly, or the hosting provider may offer IPv6 addressing but not full IPv6 routing across all plans. In those cases, the AAAA record resolves, but the traffic never reaches the server. This is why IPv6 configuration needs both DNS and network-level support before it works reliably.

Question 5

Can a CDN or load balancer block IPv6 visitors?

Accepted Answer

A CDN or load balancer can affect IPv6 access if it is not configured to handle IPv6 traffic. Even when a domain has an IPv6 address, these systems sit in front of the server and decide how incoming requests are routed. If they accept only IPv4 on the front end, IPv6 connections will not pass through. Some setups use IPv6 on the public side but connect to the backend over IPv4. Others work the opposite way. This is common across many platforms and is not a problem in itself. It simply means the full path is not using IPv6 from start to finish. IPv6 works when every layer in the chain can speak it. If a CDN or load balancer does not support IPv6, IPv6 visitors may not reach the site even though DNS resolves correctly. This is why IPv6 checks look beyond just the presence of an AAAA record.

Question 6

How can I quickly check if my ISP or hosting provider supports IPv6?

Accepted Answer

One of the simplest ways to check IPv6 support is to see whether your connection receives an IPv6 address. Most operating systems show this in their network settings. If an IPv6 address appears, your ISP is at least offering basic IPv6 connectivity. You can also run a quick test by visiting any public IPv6 test page or checking a domain known to use IPv6. If the connection succeeds, your ISP is correctly routing IPv6 traffic. Hosting providers list IPv6 availability in their plan details, and many offer a test IPv6 address so you can confirm that the network responds. If neither your ISP nor your hosting provider shows an IPv6 address or a working response during a simple test, they may not have IPv6 enabled on your plan or in your region. In those cases, checking their documentation or asking support is the most direct way to confirm IPv6 availability.

IPv6 Website Compatibility Checker

What is an IPv6 Compatibility Checker?

IPv6 Compatibility Checker

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