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

Short answer: IPv4 = 32-bit addresses, IPv6 = 128-bit. That’s the *big* difference between ipv4 and ipv6.

Long answer: IPv6 fixes a lot of ipv4’s clunky stuff. No more NAT, better auto-configuration, and yeah, way more addresses.

Is it faster? Sometimes. More secure? In theory, but only if configured right.

If you’re curious, [ipv6-test.com](http://ipv6-test.com/) shows if you’re using it. Most modern OSes support it, so you might already be on ipv6 without knowing!