DNS propagation checker

What "propagation" actually means

A DNS change does not push out to the internet the moment you make it. Every resolver that has already looked up the old answer is entitled to keep serving it from cache until the record's TTL expires - so "has it propagated" really means "have the caches that matter to me expired yet", which is a different question for every resolver.

What this tool does and does not show

It queries several well-known public resolvers - Cloudflare, Google, Quad9, OpenDNS - directly and independently, right now, and shows you exactly what each one currently returns. It cannot and does not claim to represent every resolver worldwide, including your own ISP's, which may have cached the old answer separately and will keep serving it until its own copy of the TTL runs out.

Reading a mixed result

Seeing different answers from different resolvers during a change is normal, not a fault - it is exactly what a TTL-based cache is supposed to look like mid-transition. It should converge once every resolver's cached copy has expired, at the latest the domain's TTL after the change was made (longer if a resolver ignores TTL, which does happen).

Related tools

See DNS lookup for a single authoritative-style answer, and check the record's TTL there to estimate how long a full changeover should take.