After a DNS change it takes a while before servers worldwide know the new value. This tool queries the record at several major resolvers and compares the answers.
What this tool does
The tool asks the same question to several public resolvers (such as Google and Cloudflare) and lines up the answers. If they match, the change is fully rolled out.
How to use it
Enter the domain name, choose the record type (A, AAAA, MX, TXT, NS or CNAME) and run the check. If the answers differ, propagation is still in progress.
Input and output
- Input: a domain name and a record type
- Output: the answer per resolver and whether they match
Limitations
The check uses a limited set of resolvers; it gives a good indication but not a globally complete measurement of every provider.
Good to know
After a change, expect anywhere from a few minutes up to the record TTL before every resolver is updated. Lower the TTL in advance if you know you will change a record soon, so propagation is faster.