Explore DNS without touching a live zone

Labs use synthetic examples and run locally after loading. They teach a protocol or operational model; live public evidence remains the job of an explicitly selected tool.

Available · optional local storage

Safe-change planner

Turn a proposed edit into a reviewable draft with owners, evidence, stop conditions, verification, and cache-aware rollback.

Available · browser-local

DNS record anatomy

Separate the owner, TTL, class, type, and type-specific RDATA in one locally entered presentation-format record.

Available · browser-local

Root-to-answer path

Compare a cold cache, cached final answer, and cached delegation to see when root, TLD, and authoritative services are contacted.

Available · browser-local

TTL and cache timeline

Compare positive and negative caching, place an authoritative change on one resolver's timeline, and inspect the exact expiry boundary.