SolveDNS checks your name servers, A records, mail servers, SOA records for errors, consistency, accuracy and speed using several DNS tests. SolveDNS does not cache any test results, so you get a fresh report everytime you run the test for your domain names.

Also NameServer Analytics:

SolveDNS checks your name servers, A records, mail servers, SOA records for errors, consistency, accuracy and speed using several DNS tests. SolveDNS does not cache any test results, so you get a fresh report everytime you run the test for your domain names. If you would like to see more tests or have a question or a comment about a test result, please don't hesitate to use the email address in the footer.