When you change a DNS record — pointing a domain to a new server or updating an MX record — the change doesn’t take effect everywhere at once. Resolvers around the world cache the old answer until its TTL expires. That gradual rollout is called DNS propagation. Our free DNS Propagation Checker queries public resolvers worldwide so you can see exactly where your change has landed.
Why DNS changes take time
Each DNS record has a TTL (time to live) that tells resolvers how long to cache it. If your TTL is 3600 seconds, a resolver that fetched the old value may keep serving it for up to an hour. Lowering the TTL before a planned change means resolvers pick up the new value faster.
How to check propagation
Open the DNS Propagation Checker, enter your domain, and pick a record type (A, AAAA, CNAME, MX, TXT, or NS). The tool queries multiple global resolvers and shows which already return the new answer and which are still serving the old one. When all resolvers agree, your change has fully propagated.