IPv4 and IPv6 are two ways of addressing devices on the internet. Most website owners do not need to become network engineers, but they should understand why a host may list both and how a careless DNS change can make a site unreachable for some visitors.

IPv4 and IPv6 in one minute

An IP address identifies a network endpoint. IPv4 uses 32-bit addresses, usually written as four decimal numbers such as 192.0.2.10. IPv6 uses 128-bit addresses written in hexadecimal groups such as 2001:db8::10. The much larger IPv6 address space was created so the internet can continue growing.

ICANN notes that the pool of unallocated IPv4 addresses was depleted in 2011 and describes the transition to IPv6. IPv4 did not disappear; both protocols now operate side by side.

How a domain points to each protocol

DNS record Purpose Example
A Points a hostname to an IPv4 address 192.0.2.10
AAAA Points a hostname to an IPv6 address 2001:db8::10

A website can publish both records. This is commonly called dual stack. A compatible visitor may connect over IPv6; another can use IPv4. The web server, firewall, TLS certificate and application must work on both paths.

Does IPv6 make a website faster?

Not automatically. Performance depends on routing, peering, server location, congestion, DNS and many other factors. Some visitors may get a better path over IPv6; others may see no difference. Enable it for reachability and future compatibility, then measure rather than promising a speed boost.

Does IPv6 make a website more secure?

IPv6 is not a security product. HTTPS, patching, authentication, backups and application security remain essential. A common risk is enabling an IPv6 address while forgetting to apply the same firewall rules and monitoring used for IPv4. Attackers will not ignore the second path because the owner did.

Follow SiteChai’s guides to DDoS protection and DNS records for the related layers.

When should a website owner enable IPv6?

Enable it when the hosting provider supports it end to end and you can test the result. It is particularly sensible for modern hosting, CDN or cloud infrastructure that already offers dual-stack service. Do not add an AAAA record merely because you found an IPv6 address in a dashboard; confirm that the address is assigned to the correct service and accepts web traffic.

A safe IPv6 rollout checklist

  1. Confirm support. Ask the host or CDN whether the website, load balancer and nameservers support IPv6.
  2. Check the address. Use only the exact IPv6 address assigned to the service.
  3. Review the firewall. Mirror the intended IPv4 policy for IPv6 without blindly copying syntax.
  4. Test before DNS. Confirm HTTP and HTTPS responses where the platform provides a testing method.
  5. Add the AAAA record. Keep the existing A record for dual stack unless the provider says otherwise.
  6. Test from both networks. Check the site, redirects, certificate, API, forms and downloads over IPv4 and IPv6.
  7. Monitor logs. Make sure security, analytics and rate-limiting tools correctly record IPv6 addresses.
  8. Keep a rollback plan. Know which DNS record to remove if the IPv6 path is broken.

Common mistakes

  • Publishing an AAAA record that points to an old or unconfigured server.
  • Allowing ports over IPv6 that are blocked over IPv4.
  • Testing only from an IPv4 office network.
  • Assuming a CDN automatically fixes an incorrect origin configuration.
  • Using software that stores IP addresses in a field too short for IPv6.
  • Blocking a whole IPv6 range because one address behaved badly.

What about shared hosting and cPanel?

Availability depends on the host’s network and panel configuration. A shared-hosting customer normally should not manually invent an address or edit low-level networking. Ask the provider whether the plan has IPv6, whether an AAAA record is created automatically and whether email services use the same address.

SiteChai customers can contact the support team to confirm the current IPv6 configuration for a specific service before changing DNS.

IPv6 and email

Email delivery has additional requirements. If a mail server sends over IPv6, it needs correct reverse DNS, SPF alignment and a good reputation, just as it does on IPv4. Do not enable outbound IPv6 mail casually. Review SiteChai’s SPF, DKIM and DMARC guide for the authentication layer.

Frequently asked questions

Can I remove my A record after adding AAAA?

Usually not. Keeping both provides the broadest reachability while the internet remains in transition. Remove IPv4 only with a clear architecture and tested compatibility plan.

Why is the IPv6 DNS record called AAAA?

An IPv6 address is four times the size of an IPv4 address, and the DNS record name evolved as four A characters.

Will Google rank an IPv6 website higher?

There is no general ranking advantage simply for using IPv6. Focus on accessibility, performance, useful content and reliable crawling.

Can Cloudflare or another CDN add IPv6 for me?

Many CDNs can serve visitors over IPv6 while connecting to an origin over IPv4, but settings and support vary. Verify the provider’s current documentation and test both paths.

References: ICANN beginner’s guide resources and ICANN’s Domain Name System overview.