IPv4 vs IPv6: What You Need to Know

Your router uses two different internet addressing systems: IPv4 and IPv6. IPv4 has been around since the 1980s, while IPv6 is the newer version designed to solve a major problem. Most home routers use IPv4 by default, but many can handle both.

Here's what you need to know about these two systems and how they affect your home network.

What IPv4 and IPv6 Actually Are

Think of IP addresses like postal addresses for your devices. IPv4 creates addresses using four numbers separated by dots, like 192.168.1.1. You've probably seen this format when you access your router settings.

IPv6 addresses look completely different. They use eight groups of letters and numbers separated by colons, like 2001:0db8:85a3:0000:0000:8a2e:0370:7334. Yes, they're much longer and harder to remember.

The Big Difference

IPv4 can create about 4.3 billion unique addresses. That sounds like a lot, but we've basically run out. With billions of phones, computers, routers, and smart devices all needing addresses, IPv4 hit its limit years ago.

IPv6 can create 340 undecillion addresses. That's a 340 followed by 36 zeros. We'll never run out of IPv6 addresses, even if every grain of sand on Earth needed one.

How to Check What Your Router Uses

Most routers support both IPv4 and IPv6, but you need to check your current setup. Here's how to find out what you're using right now.

Check Your Current IP Address

Visit our IP address checker tool. If you see four numbers separated by dots, you're using IPv4. If you see a long string with letters and colons, you're using IPv6.

Check Your Router Settings

Log into your router's admin panel. Most routers use 192.168.1.1 or 192.168.0.1 as their login address.

Look for a section called "Internet" or "WAN Settings." You'll see either IPv4 or IPv6 settings, or both.

Enabling IPv6 on Popular Router Brands

If your internet provider supports IPv6, you can enable it on most modern routers. Here's how to do it on popular brands.

Netgear Routers

1. Log into your Netgear router using your admin credentials
2. Click "Advanced" then "IPv6"
3. Select "Auto Detect" from the Internet Connection Type dropdown
4. Click "Apply" and wait for the router to restart
5. Check the IPv6 status to confirm it's working

TP-Link Routers

1. Access your TP-Link router admin panel
2. Go to "Advanced" then "IPv6"
3. Choose "Auto Obtain" as the connection type
4. Click "Save" and let the router reboot
5. Verify the IPv6 address appears in the status section

Asus Routers

1. Open the Asus router interface
2. Navigate to "Adaptive QoS" then "IPv6"
3. Set Connection Type to "Automatic"
4. Enable "Auto Configuration Setting"
5. Click "Apply" to save changes

Linksys Routers

1. Log into your Linksys router settings
2. Go to "Smart Wi-Fi Configuration" then "IPv6"
3. Select "Automatic Configuration - DHCP"
4. Save the settings and restart the router
5. Check the connection status after reboot

Do You Actually Need IPv6?

For most home users, IPv4 works perfectly fine right now. Your router probably uses Network Address Translation (NAT) to share one public IPv4 address among all your devices.

But IPv6 does have some advantages you might care about.

Better for Gaming

IPv6 can reduce latency in online gaming. Since each device gets its own public address, there's less network translation happening. Some gaming consoles perform better with IPv6 enabled.

Easier Device Connections

With IPv6, devices can connect to each other more directly. This helps with file sharing, video streaming between devices, and smart home setups.

Future-Proofing

New internet services increasingly support IPv6 first. Having it enabled means you won't miss out on new features or faster connections.

Common IPv6 Setup Problems

IPv6 doesn't always work smoothly. Here are the most common issues and quick fixes.

Internet Provider Doesn't Support IPv6

Many internet providers, especially smaller ones, still don't offer IPv6. You can enable it on your router, but it won't actually work until your provider supports it. Contact them to ask about IPv6 availability.

Slow Internet After Enabling IPv6

Sometimes enabling IPv6 can slow down your connection. This usually happens when your provider's IPv6 setup isn't optimized. Try disabling IPv6 to see if your speed improves.

Can't Access Certain Websites

A few websites don't work properly with IPv6. If you suddenly can't reach specific sites after enabling IPv6, try disabling it temporarily to test.

Security Differences Between IPv4 and IPv6

IPv6 has some built-in security features that IPv4 lacks, but it also creates new challenges for home users.

IPv6 Security Benefits

IPv6 includes IPSec encryption by default. This means data traveling between devices has better protection against eavesdropping.

IPv6 Security Concerns

Since every device gets a public address with IPv6, each device is potentially reachable from the internet. Your router's firewall becomes more important.

Make sure your router's IPv6 firewall is enabled. Most routers enable this by default, but double-check in your security settings.

Which Should You Use?

For most home users, keeping both IPv4 and IPv6 enabled makes the most sense. This is called "dual stack" mode.

Your devices will use IPv4 for sites that only support IPv4, and IPv6 for sites that support it. The router handles the switching automatically.

When to Disable IPv6

Consider disabling IPv6 if:

• Your internet speed drops significantly after enabling it
• You can't access important websites
• Your router becomes unstable or crashes frequently
• You're troubleshooting network problems

When to Keep IPv6 Enabled

Keep IPv6 enabled if:

• Your internet provider fully supports it
• You play online games regularly
• You use many smart home devices
• You share files between devices on your network

Testing Your IPv6 Connection

After enabling IPv6, test that it's working properly. Visit an IPv6 test website or use our IP address tool to verify you have both IPv4 and IPv6 addresses.

A working IPv6 setup should show you have connectivity for both protocols. If IPv6 shows as not working, check your router settings and contact your internet provider.

Summary

IPv4 and IPv6 are both addressing systems for internet devices. IPv4 uses short, familiar addresses but we're running out of them. IPv6 uses longer addresses but provides unlimited capacity.

Most home routers can run both systems simultaneously. Enable IPv6 if your internet provider supports it and you want better gaming performance or future-proofing. Keep IPv4 enabled for compatibility with older websites and services.

If you run into problems after enabling IPv6, you can always disable it and stick with IPv4 until your provider improves their IPv6 service.