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VPS → IPv4 vs IPv6
IPv4 vs IPv6 for VPS
IP addresses are how your VPS connects to the rest of the internet — but not all IPs are created equal. Whether you’re scaling a website or launching an app, the difference between IPv4 and IPv6 can impact performance, availability, and even SEO.
Let’s break down what makes these two protocols different and which one makes the most sense for your VPS.
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What are IPv4 and IPv6?
Your VPS needs an IP address to communicate with the internet. IPv4 and IPv6 are simply two different ways of assigning those addresses.
IPv4 explained
IPv4 has been the backbone of the internet since the early days. It uses 32-bit numeric addresses, like 192.0.2.1, and provides around 4.3 billion possible unique addresses. That might sound like a lot, but with the explosion of internet-connected devices, we’re now well past the point of exhaustion.
IPv6 explained
IPv6 solves that limitation with 128-bit alphanumeric addresses, such as 2001:0db8:85a3::8a2e:0370:7334. It supports over 340 undecillion addresses—more than enough for every grain of sand on Earth to have its own IP.
Beyond the numbers, IPv6 enables better routing, more efficient connections, and modern networking features that IPv4 was never designed for.
Why IPv4 is still relevant for VPS users
IPv4 is old but not obsolete. In fact, most VPS setups still rely on it.
- Many ISPs, browsers, and apps default to IPv4
- Legacy systems often aren’t IPv6-compatible
- SSL, DNS, and email services frequently expect an IPv4 presence
- Most server control panels are still IPv4-first in configuration
If your users or clients expect plug-and-play compatibility, IPv4 is non-negotiable for now.
The benefits of IPv6 for VPS performance and scalability
IPv6 was designed for the modern internet. It’s faster, leaner, and future-proof.
- No need for NAT (Network Address Translation), so it removes a layer of complexity
- Direct, end-to-end connectivity speeds up latency-sensitive apps like VoIP or video
- Automatic configuration simplifies large-scale deployments
- Built-in support for security features like IPSec
IPv6 really shines when you’re dealing with scale, mobile traffic, or global audiences.
IPv4 vs IPv6: key differences at a glance
| Feature | IPv4 | IPv6 |
|---|---|---|
| Address format | 32-bit, numeric (e.g. 192.0.2.1) | 128-bit, alphanumeric (e.g. 2001:db8::) |
| Total address space | ~4.3 billion | 340 undecillion+ |
| NAT required | Yes | No |
| Built-in security | Optional (IPSec) | Mandatory (IPSec) |
| Deployment maturity | Universal | Still growing |
| Speed/latency | May require routing layers | More efficient, fewer hops |
When to prioritize IPv6 on your VPS
Not every VPS user needs IPv6, but some definitely benefit more than others. Consider IPv6 if:
- You’re running high-scale apps like IoT platforms or cloud-native microservices.
- You want to serve mobile-first or international audiences more efficiently.
- You’re preparing infrastructure that needs to last for 5+ years.
- You’re hosting in regions where IPv4 availability is limited or expensive.
Can you use both IPv4 and IPv6 on the same VPS?
Absolutely! And in most cases, you should. This setup is called dual stack, and it’s the most flexible approach. It:
- Maintains compatibility with older IPv4 systems
- Allows IPv6 traffic to flow directly when supported
- Reduces risk of future migration headaches
- Many OSes and panels make it easy to manage both side-by-side
Dual stack helps you bridge the present and future without locking yourself in.
SEO and email deliverability: does IPv6 matter?
IPv6 can indirectly affect both in good and bad ways.
- IPv6-only VPS servers may struggle with outbound email deliverability if receiving servers expect IPv4.
- Dual-stack setups improve availability and can boost trust signals like uptime and reachability.
If SEO or email is a big part of your strategy, make sure you aren’t going IPv6-only just yet.
Common myths about IPv6 for VPS hosting
IPv6 can sound intimidating, but many concerns are outdated or misunderstood.
- Myth: IPv6 is faster. Not inherently. It’s just more efficient when the network path supports it.
- Myth: You must choose one. Dual stack is the norm for modern servers.
- Myth: It’s too complex to set up. Most VPS dashboards and Linux distros offer simple IPv6 configuration today.
- Myth: IPv6 is only for large enterprises. Any VPS user can benefit, especially those thinking long-term.
Frequently asked questions (FAQ)
Next steps for choosing IPv4 vs IPv6 for your VPS
IPv6 isn’t just a nice-to-have anymore: it’s becoming essential for scaling your VPS into the future. But IPv4 still matters for compatibility, legacy systems, and current infrastructure.
When choosing or configuring your VPS, look for support for both IP protocols, and consider enabling IPv6 early to future-proof your stack.
When you’re ready to upgrade your hosting to a high-quality VPS, Liquid Web can help. We’ve been leading the industry for decades, because our VPS servers are fast, cloud-based for easy scalability, and unbeatably reliable. Choose your favorite OS and the management tier that works best for you.
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Additional resources
VPS: A beginner’s guide →
A complete beginner’s guide to virtual private servers
Protect your VPS from DDoS attack →
9 steps to harden your virtual server
Expert tips for managing your VPS →
A complete guide to help you run your VPS with confidence
Brooke Oates is a Product Manager at Liquid Web, specializing in Cloud VPS and Cloud Metal, with a successful history of IT/hosting and leadership experience. When she’s not perfecting servers, Brooke enjoys gaming and spending time with her kids.
