IPv6 vs IPv4: What’s the Difference and Should You Turn On IPv6 at Home?
Contents
Your router may have a setting called IPv6, and your provider may or may not support it. For most people, the question is not what IPv6 is in theory but whether to turn it on, and whether anything breaks if they do. The short answer: if your provider offers IPv6, leave it on; it works alongside IPv4 and usually makes no visible difference. Here is why, and the few cases where switching it off is reasonable.
The Difference in One Table
| IPv4 | IPv6 | |
|---|---|---|
| Address length | 32 bits | 128 bits |
| Number of addresses | About 4.3 billion | About 3.4 × 10³⁸ |
| Looks like | 192.168.1.1 | 2001:db8::1 |
| At home | One public address shared by all devices through NAT | Every device can get its own public address |
| Router’s admin page | Usually opened at an IPv4 address | Routers keep using IPv4 for that |
Why IPv6 Exists
IPv4 has room for about 4.3 billion addresses, far fewer than the number of devices online today. The central pool of IPv4 addresses ran out in 2011, and regional registries followed. Providers now stretch the remaining addresses with tricks such as carrier-grade NAT, where many customers share one public address — see what is CGNAT.
IPv6 solves the shortage for good with 128-bit addresses. It is not a replacement you switch to overnight: networks run both side by side (dual stack), and your devices use IPv6 to reach sites that support it and IPv4 for the rest. Google publishes the share of its users who connect over IPv6, and it has grown steadily for years.
What Changes at Home
Usually nothing you notice. Browsing, streaming and apps work the same; your devices simply use IPv6 where available.
No NAT for IPv6. With IPv4, your router shares one public address among all devices. With IPv6, each device gets its own public address. That sounds less safe, but the router’s IPv6 firewall blocks unsolicited incoming connections by default, so devices are not exposed. Modern systems also use temporary, changing IPv6 addresses for outgoing connections, which limits tracking.
Sometimes better connections. Some networks route IPv6 more directly than IPv4, especially where the provider uses CGNAT for IPv4. Games and video calls can benefit, though the effect varies.
A way around CGNAT. If your provider shares IPv4 addresses, IPv6 can make your devices reachable from outside again — useful for remote access, as long as the other side has IPv6 too.
Your router admin address stays the same. You still open the router at its familiar IPv4 address, such as 192.168.0.1; see what is my router IP.
How to Check Whether You Have IPv6
- Router status page. Look for an IPv6 or WAN IPv6 address. An address starting with 2 or 3 is a public IPv6 address; one starting with fe80 is only a local link address and does not count.
- Your device. On Windows,
ipconfiglists an IPv6 address for the adapter; on a Mac, System Settings → Network → your connection → Details → TCP/IP shows it. - An online test. Sites such as test-ipv6.com check whether your connection reaches IPv6 sites and score your setup.
If you see no public IPv6 address anywhere, your provider may not offer it, or the router may have it switched off.
How to Enable IPv6 on Your Router
- Log in to the router and find the IPv6 section, often under Advanced or Internet settings.
- Turn it on and choose the connection type. Most providers work with Auto or Auto-detect; others need DHCPv6, SLAAC, PPPoE (with the same login as IPv4) or a tunnel type such as 6rd with settings from the provider. If you are unsure, start with Auto and check the status page.
- Make sure the IPv6 firewall is enabled. On most routers it is on by default and blocks incoming connections.
- Save, restart the router if asked, and check the status page for a public IPv6 address.
If no address appears, ask your provider whether IPv6 is available on your plan and which connection type to use.
When Turning IPv6 Off Makes Sense
Disabling IPv6 is rarely necessary, but there are a few legitimate reasons:
- A specific device or app fails only when IPv6 is on — usually old smart-home gadgets or outdated firmware. Update the device first; disable IPv6 on the router only if updates do not help.
- Your VPN does not support IPv6. Some VPNs only route IPv4, so IPv6 traffic could bypass the tunnel. Use a VPN that handles IPv6, or turn IPv6 off on that device.
- The provider’s IPv6 is unreliable. If sites load slowly or fail intermittently and switching IPv6 off fixes it, report it to the provider and keep IPv6 off until they resolve it.
When you do turn IPv6 off, turn it off on the router rather than on every device, and check from time to time whether the problem is gone; IPv6 will only become more important.
Frequently asked questions
Should I enable IPv6 on my router?
Yes, if your provider supports it. It runs alongside IPv4, is protected by the router’s firewall and prepares your network for services that increasingly prefer IPv6.
Is IPv6 faster than IPv4?
Not inherently. On some networks, especially those using carrier-grade NAT for IPv4, IPv6 routes can be more direct, but for most people the difference is small.
Is IPv6 less secure because there is no NAT?
No. The router’s IPv6 firewall blocks unsolicited incoming connections, which is the protection NAT provided as a side effect.
Why does my router show an IPv6 address starting with fe80?
That is a link-local address, used only within your network. A public IPv6 address from your provider usually starts with 2 or 3.
Does IPv6 affect gaming?
Usually not noticeably. If your provider uses CGNAT for IPv4, IPv6 can help some games and voice chat connect more directly.