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.
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 · 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.