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Short, practical guides that pair with the tools. Every post links straight to the free browser-based tool it explains — no fluff, no sign-up.

Subnetting Worked Examples: Splitting a /24

The block-size shortcut, worked examples, and the three sanity checks. · Oct 13, 2026

JWT Claims Explained

The registered claims that matter, clock skew, and a claim-review checklist. · Oct 13, 2026

Regex Cheat Sheet

Classes, anchors, quantifiers, groups, and ten patterns worth memorising. · Oct 13, 2026

CIDR Basics: Prefixes, Blocks, and Summarization

Prefix lengths, usable ranges, supernetting, and wildcard masks in ACLs. · Oct 13, 2026

MD5 vs SHA-256: Which Hash Should You Use?

Why MD5 and SHA-1 are out, what to use today, and why passwords are different. · Oct 13, 2026

Unix Time Explained: Epoch and 2038

Seconds vs milliseconds, the 2038 problem, and epoch in databases and APIs. · Oct 13, 2026

Cron Expressions Explained

The five fields, special strings, DST traps, and ten schedules you will need. · Oct 13, 2026

YAML vs JSON: Picking a Config Format

What each format is good at, where each one bites, and a decision table. · Oct 13, 2026

JWT Security: Signing, Expiry, and Storage

HS256 vs RS256, expiry and revocation reality, and where to store tokens. · Oct 13, 2026

URL Encoding: Percent-Encoding Rules

Reserved characters, encodeURI vs encodeURIComponent, and the + versus %20 trap. · Oct 13, 2026