IPv6 quietly crossed 50% of Google's traffic in early 2026. A from-scratch explanation of why the internet ran out of IPv4 addresses, how IPv6 actually differs beyond just being bigger, and the genuinely useful things a 128-bit address space makes possible.
Fundamentals
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IPv6 Basics: Why We Need It, How It Differs from IPv4, and What It Unlocks -
Subnetting Explained: Why Subnet Masks Aren't Just 255s and 0s A from-intuition walk through subnetting, and a direct answer to the question every beginner eventually asks: would you ever use a subnet mask octet that isn't 255 or 0? Yes — constantly — and here is exactly when and why.