What’s the main difference between IPv4 and IPv6? Which one should I use? Alternatively, if you want a sligh

Wow, thanks for all the replies! You guys really cleared up the difference between ipv4 and ipv6 for me. I had no idea ipv6 had built-in security stuff—that’s pretty cool.

I checked [test-ipv6.com](https://test-ipv6.com/) like some of you suggested, and turns out my ISP *does* support it! I’ll poke around my router settings later and see if I can enable it.

One follow-up: if I switch to ipv6, will my old devices (like my ancient printer) still work? Or do they *have* to support ipv6 too?

Thanks again! 🙌