Check My DNS is a custom developed DNS nameserver that creates dynamic delegated subdomains to enable clients to query for never-seen-before resource records in order to support a general-purpose framework for testing DNS resolvers.
Read more about it or try it at one of the instances below:
- https://cmdns.dev.dns-oarc.net
- https://cmdns2.dev.dns-oarc.net
- https://tcmdns.dev.dns-oarc.net (used primarily for development, may not work)
There is also a command line client (cmdns-cli) that you can run locally, this will allow you to specify which resolver to test against.
As a DNS-OARC member you can get access to all of the raw test data on our analysis servers, if you wish to have access but currently don't have access to the analysis servers please contact us.