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Queries the same DNS record on Google and Cloudflare's public resolvers and compares the answers to detect whether a recent change has fully propagated.
After changing a DNS record, each resolver refreshes its cache according to the configured TTL. It is normal to see different answers for a few minutes or hours.
We only compare two large public resolvers, not a global network of propagation vantage points. It is a quick signal, not a complete worldwide propagation map.
Frequently asked questions
It depends on the previous record's TTL; it can range from minutes to 24-48 hours for high-TTL cases.
They are two of the most used public resolvers with a reliable, openly queryable API — enough for a quick consistency signal.