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IP Version Detector

Detect whether a domain uses IPv4, IPv6, or dual-stack networking.

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IP Version Detector - Check IPv4 vs IPv6 Support for Any Domain

The IP Version Detector helps you quickly verify whether a domain is reachable via IPv4, IPv6, or both (dual-stack). It checks DNS records (A for IPv4 and AAAA for IPv6) and reports what your domain is advertising to the internet. This is useful for technical SEO audits, infrastructure checks, CDN setups, and troubleshooting accessibility issues across different networks and countries.

What is an IP Version Detector?

An IP Version Detector is a diagnostic tool that identifies whether a domain supports IPv4, IPv6, or both. In simple terms, it answers: “Does this domain have an IPv4 address, an IPv6 address, or both?” The tool performs a DNS lookup and reports the presence of A (IPv4) and AAAA (IPv6) records. If both record types exist, your site is considered dual-stack.

Understanding IPv4 vs IPv6

IPv4 is the older, widely used internet protocol that uses 32-bit addresses. It powers much of today’s internet, but it has a limited pool of addresses. IPv6 is the newer protocol using 128-bit addresses, designed to solve address exhaustion and improve routing efficiency. IPv6 adoption is increasing globally—especially on mobile networks—so understanding your domain’s IP version support is an important part of modern web operations.

Why IP Version Support Matters

IP version support impacts compatibility, reliability, and long-term readiness. Many users still rely on IPv4, while many modern carriers and ISPs increasingly prefer IPv6. If you only support one protocol, some users may experience slower routes, translation layers, or in rare cases connectivity issues. Dual-stack support reduces friction and ensures your domain is reachable from both IPv4-only and IPv6-enabled networks.

What This Tool Checks

The IP Version Detector focuses on the DNS-level truth: what your domain publicly publishes as its IP addresses.

  • A records (IPv4): Shows whether the domain resolves to one or more IPv4 addresses
  • AAAA records (IPv6): Shows whether the domain resolves to one or more IPv6 addresses
  • Dual-stack detection: Confirms if both A and AAAA records exist
  • Address listing: Displays discovered IPv4 and IPv6 addresses for quick review

How to Use the IP Version Detector

Enter a domain (for example: example.com) and run the check. The tool will show whether IPv4 is detected, whether IPv6 is detected, and list the IP addresses found. If you see IPv4 only, your domain is not publishing IPv6 addresses. If you see IPv6 only, your domain may not be reachable on older IPv4-only networks unless your hosting provider provides translation support. If you see both, your configuration is generally considered best practice for public websites.

What 'Dual-Stack' Means (and Why It's Usually Best)

Dual-stack means your domain supports both IPv4 and IPv6 at the same time. This is widely recommended because it provides maximum compatibility and helps users reach your site using the best path available. Dual-stack is especially helpful for international audiences and mobile users where IPv6 is common. If your hosting and CDN support it, dual-stack is a strong, future-proof default.

IPv4-Only: When It's OK, and When It's Not

IPv4-only domains still work for the majority of users today, but they are less future-ready. Some networks route IPv4 traffic through additional layers, and in certain environments IPv6 may provide faster or more direct paths. If your domain is IPv4-only, it’s not necessarily a crisis—but enabling IPv6 is generally a smart upgrade if your provider supports it and your security rules are configured properly.

IPv6-Only: Modern, but Risky for Public Sites

IPv6-only is technically advanced, but it can create compatibility gaps. While many modern networks support IPv6, a portion of users still rely on IPv4-only access. Unless your hosting/CDN provides reliable IPv4-to-IPv6 translation, an IPv6-only setup can make your site unreachable for some visitors. For most public websites, IPv6-only is not recommended; dual-stack is the safer choice.

Technical SEO Benefits

IP version support is not a direct ranking factor, but it influences performance, availability, and crawl accessibility. Search engines increasingly operate within IPv6-capable infrastructure, and many crawling environments can use IPv6 routes. If your site supports IPv6, it may reduce potential crawl friction in some networks and improves overall technical quality. It also shows your infrastructure is modern and well-maintained, which aligns with broader SEO best practices.

Security Notes for IPv6

Enabling IPv6 is a positive step, but it requires correct firewall policies and monitoring. Some site owners enable IPv6 via CDN or hosting without updating firewall rules, leaving unintended services exposed. If you enable IPv6, treat it like IPv4: allow only what you need (typically 80/443), block what you don’t, and ensure logging and rate limiting apply to IPv6 traffic as well.

Common Use Cases

This tool is helpful in many scenarios:

  • You’re migrating servers or switching hosting providers
  • You enabled Cloudflare/CDN and want to confirm IPv6 publishing
  • You’re doing a technical SEO audit for a client site
  • You suspect some users cannot reach your website from certain networks
  • You want to modernize infrastructure and verify dual-stack status

Tips to Fix IPv4/IPv6 Configuration Issues

If you’re IPv4-only and want IPv6, check if your hosting provider or CDN supports IPv6. Usually, the fix is adding AAAA records or enabling IPv6 at the CDN level. If you’re IPv6-only but need IPv4 compatibility, add A records (or enable a CDN/edge that provides IPv4 reachability). After changes, re-run this tool to confirm DNS is publishing the correct records. Keep in mind DNS changes can take time to propagate depending on TTL settings.

FAQ

What does this tool detect exactly?
It detects whether a domain publishes IPv4 (A records), IPv6 (AAAA records), or both in DNS.
Is IPv6 required for SEO?
Not required, but recommended as a modern infrastructure best practice. It can improve compatibility and future readiness.
What does dual-stack mean?
Dual-stack means your domain supports both IPv4 and IPv6, allowing visitors to reach your site via either protocol.
Why do some domains show multiple IPs?
Many sites use load balancing, CDNs, or multiple servers, which can publish multiple A/AAAA records.
If I have AAAA records, does that guarantee IPv6 works?
It indicates IPv6 is published in DNS, but full functionality also depends on server/CDN configuration and firewall rules.
Can IPv6-only break access for some users?
Yes. Some networks and devices still rely on IPv4-only connectivity. Dual-stack is usually safer.
Does the tool use any third-party APIs?
No. It relies on standard DNS lookups on your server.
Why does the tool say no records detected?
The domain may be invalid, not configured, temporarily failing DNS, or blocking DNS resolution in your environment.
How can I enable IPv6 for my domain?
Enable IPv6 with your host or CDN and publish AAAA records (or use a provider that automatically serves IPv6).
How long do DNS changes take to reflect?
It depends on TTL and resolver caching. Changes can appear quickly, but sometimes take hours to fully propagate.
Is IPv6 more secure than IPv4?
IPv6 isn’t automatically more secure. Security depends on correct firewall rules, patching, and monitoring for both protocols.
Should I add IPv6 if my audience is global?
Yes, dual-stack often improves reachability and performance in regions where IPv6 is widely used.

Related tools

Pro tip: pair this tool with Reverse DNS Lookup (PTR) and IP Range to CIDR Converter for a faster SEO workflow.