Dev Tools · 2h ago
DNS Propagation: Why Your Change Takes Minutes to Days
DNS propagation isn't a fixed time but a probability distribution shaped by TTL and resolver policies. Google DNS may reflect changes in 60 seconds, while ISP resolvers like Deutsche Telekom can take up to 24 hours. The delay depends on when each resolver last cached the old record.
Meridian48 take
This is a practical deep dive into DNS mechanics that every developer should understand, but the article's real value is in explaining why 'it works on my machine' is a dangerous assumption during deployments.
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DNS Propagation Time: How Long Until Your DNS Change Goes Live? →
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