~/dnsprobe/blog · ls -lah 22 entries · rss rss

Field notes on DNS, TLS & the resolver layer.

Practical writing for engineers who debug production. No "in today's digital landscape", no listicles — just the technical detail you needed at 2am.

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2026-05-21 · /blog/the-12-global-dns-resolvers-we-probe

The 12 global DNS resolvers we probe — and why each matters

A short tour of the resolver fleet dnscheck queries: Cloudflare, Google, Quad9, OpenDNS, Yandex, Comodo, Verisign, Hurricane Electric, AdGuard, and the rest. Why this exact list.

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2026-05-21 · /blog/how-dns-propagation-actually-works

How DNS propagation actually works (and why your change is not live yet)

The phrase "DNS propagation" is misleading. Authoritative changes happen instantly; what you are waiting for is recursive resolver caches to expire. Here is the actual mechanism.

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