IPv6 failed the internet, but it's secretly winning in your home network

Published Sep 24, 2026, 11:30 AM EDT Monica J. White is a journalist with over a decade of experience in covering technology. She built her first PC nearly 20 years ago, and she has since built and tested dozens of PCs. PC hardware is her main beat, and graphics cards and the GPU market at large are her main area of interest, but she has written thousands of articles covering everything related to PCs, laptops, handhelds, and peripherals. From GPUs and CPUs to headsets and software, Monica's always willing to geek out over all things related to computing. Outside of her work with How-To Geek, Monica contributes to TechRadar, PC Gamer, Tom's Guide, Laptop Mag, SlashGear, Whop, and Digital Trends, among others. Her ultimate goal is to make PC gaming and computing approachable and fun to any audience. Monica spends a lot of time elbow-deep in her PC case, as she's always making upgrades, testing something, or plotting out her next build. She's the go-to tech support person in her immediate circle, so she's never out of things to do. Whenever she has spare time, you'll find her gaming until the early hours and hanging out with her dog. How many times have you heard the phrase "the future of the internet" in relation to a product or a piece of software that was very much not the future of the internet? Many, I'd wager. You may have heard it in relation to IPv6, too, which was supposed to replace IPv4. That never happened, and IPv4 found ways to stick around, but that doesn't make IPv6 useless. IPv6 never actually managed to kill IPv4 We ended up with two internets glued together instead Before we dig deeper, a little explainer: IPv4 and IPV6 are the two main versions of the Internet Protocol. That's the system that gives devices addresses and lets data find its way between them. IPv6 is the newer replacement, and it was designed to solve IPv4's greatest issues, chief among which is limited address space. So, IPv6 technically came to replace IPv4. But that didn't happen. The reason IPv4 resisted being replaced is that we got super good at working around its biggest limitation. There are only around 4.3 billion IPv4 addresses to go around, which sounds like a boatload, but obviously, we have more devices than that in the world at this point. When you add up every phone, laptop, PC, TV, server, and so on, there's so many more addresses that need to be in use. But instead of replacing IPv4 outright, though, technologies like NAT let entire home networks share a single public address. Meanwhile, CGNAT lets ISPs do something similar across many customers. This stuff lumps all these different gadgets and networks together. Today's internet is a mix: We've got some direct IPv4, some IPv4 hidden behind NAT or CGNAT, and IPv6, which is pretty far from the clean handover we originally thought was going to happen. But IPv6 made a lot of progress Maybe not as much as we thought, but still Credit: Andrew Heinzman / How-To Geek IPv6 may not have replaced IPv4, but it made a huge amount of progress anyway. Google crossed the point where roughly half of its users were reaching it over IPv6 in 2026. Meanwhile, APNIC's measurements show slow adoption, but at least it's a slow climb. Are we close to getting to a point where IPv6 is king, though? Not at all. After a very long climb, we have the two protocols coexisting rather than one replacing the other. Translation and compatibility mechanisms make this possible. While this coexistence makes IPv6 look like it failed the job, the truth is that things start to look very different once you look inside your very own home network. Your home probably already speaks IPv6 Your devices don't need you to configure it manually Credit: Ismar Hrnjicevic / How-To Geek You don't need any fancy-schmancy kind of thing to run IPv6 at home. Modern operating systems are happy to run both protocols simultaneously, and Windows may actually prioritize IPv6 global unicast addresses over IPv4 when both are available. That basically means your PC (or whatever device) might already be using IPv6 when the network supports it, even if you've never made it a point to dig through your router settings and turn it on. IPv6 also handles local communication, and it can slot nicely into many home networks. Your devices can automatically configure IPv6 addresses instead of having you do it manually, which is always a nice thing, as network troubleshooting can be a nightmare. They'll also usually have link-local addresses that let them talk to other devices on the same local network segment. Seeing an fe80:: address doesn't mean you necessarily have working IPv6 internet, but it does show that IPv6 is an essential part of modern networking, even if it's not the leading part we thought it'd become over time. IPv6 solves problems inside your home that IPv4 works around Your smart home may be IPv6's biggest win Credit: Bertel King / How-To Geek This entire IPv6 vs. IPv4 conversation only gets more interesting once you move into the topic of the smart home. IPv4 works perfectly well for a handful of devices, but it increasingly relies on workarounds like NAT to keep all those devices sharing limited address space. Enter: IPv6. It was designed with a much larger address space and automatic configuration in mind, which makes it a better fit for homes where there are lots of devices begging for some airspace ... which, you guessed it, means homes with a lot of smart home gadgets. Thread, for example, was built around IPv6 from the start. That means compatible locks, bulbs, sensors, and switches can communicate over an IPv6-based mesh. Matter is also IP-based, and can run over Thread, Wi-Fi, or Ethernet. So, the bottom line is that newer devices are increasingly designed around IPv6, as it solves problems that IPv4 can never fix on its own. IPv6 works best when you barely notice it Credit: Andrew Heinzman / How-To Geek Perhaps the best part of IPv6 is that it's entirely low maintenance. Most users never give it a second thought, or even know it exists, because their PCs don't ask them for their opinion on the IPv4 vs. IPv6 situation. You shouldn't have to manually configure an address before the device will work. The OS, the router, and the devices sort that out for you without you needing to interfere or having to pull out your network "go-bag." IPv4 doesn't need to die for IPv6 to win So, while we never got that big moment where IPv4 died and was replaced entirely, IPv6 is still successful in its own way. It may never become the only protocol, but that's no longer the point, and it succeeds where it truly matters.