Tool DNS Propagation
Has your DNS change spread?
After you change a record, DNS servers keep the old answer until it expires. This asks 16 public DNS servers run by different operators and shows whether they agree.
About the DNS Propagation
When you change a DNS record, such as pointing a domain to a new server, resolvers around the world keep serving the old answer until their cached copy expires. This period is known as DNS propagation and can take from a few minutes to 48 hours, depending on the record's time to live (TTL).
This checker asks public DNS servers run by different operators in North America, Europe and Asia at the same time and shows whether their answers agree. When every server returns the new value, your change has spread.
Frequently asked questions
Usually from a few minutes up to 48 hours. The main factor is the TTL that was set on the old record: resolvers can keep the old answer for that many seconds after the change.
Lower the record's TTL (for example to 300 seconds) a day before you make the change. Once the change has spread, you can raise the TTL again.
They are still holding a cached copy of the old record. Check again after the TTL has passed; if one server stays out of date for days, the record may have been changed in the wrong place.