DNS Propagation Checker
Use this DNS propagation checker to compare live DNS answers from multiple public resolvers and see whether a domain change is beginning to propagate.
How to Use the DNS Propagation Checker
Enter a domain and record type to compare DNS answers and see whether a recent change is becoming visible.
Practical Example
After changing an A record, checking propagation can reveal whether resolvers are returning the new IP address.
Factors That Affect the Result
TTL values, resolver caches, authoritative nameservers and timing of the change affect propagation.
Frequently Asked Questions
Is propagation instant?
No, cached records may remain until TTL expiration.
Why can locations differ?
Resolvers refresh cached data at different times.
Can I force all caches to update?
No, external resolver caches are not under the domain owner’s direct control.
Understanding DNS Propagation Results
DNS propagation describes the period during which recursive resolvers around the world begin using updated DNS records. A change does not reach every resolver at the same moment because cached answers can remain available until their TTL expires. The checker is useful after changing nameservers, A or AAAA records, CNAME records, MX records, or other DNS settings.
How to Interpret Different Answers
If some locations show the new value while others show the old one, the change is usually still propagating or a resolver is serving cached data. A missing answer can also indicate an incorrect record, delegation problem, DNSSEC issue, or temporary resolver failure. Compare the expected record type and value rather than relying on a single location.
Practical Tips
Verify the record at the authoritative DNS provider first, note the configured TTL, and allow sufficient time before making repeated changes. Lowering TTL before a planned migration can reduce cache duration, but it does not make updates instantaneous. For email or website migrations, confirm related records as well so one corrected record does not hide another configuration issue.