What’s the main difference between IP version 4 and IP version 6? or Can someone explain the key diff

NAT is a hack, and IPv6 fixes it. That’s the biggest difference between ip version 4 and ip version 6 for me.

But why’s IPv6 so scary-looking? Here’s a trick: `2001:db8::1` is way shorter than `2001:0db8:0000:0000:0000:0000:0000:0001`. Just drop leading zeros and collapse consecutive zero blocks with `::`.

Tool rec: [SubnetOnline](https://www.subnetonline.com/) for playing with both IPv4 and IPv6 subnets.