Service and accuracy
Results reflect DNS data returned by the selected public resolver at lookup time and may be cached. We do not guarantee complete results, uninterrupted availability or fitness for a specific purpose. MX records do not guarantee delivery; use your provider’s instructions and actual mail tests.
Reasonable use
Use public domain data responsibly. Do not bypass limits, disrupt the service or use it for abusive email activity. The endpoint is rate limited and is not offered as a bulk-query service or under a service-level agreement.
Third parties and changes
Public DNS, hosting and advertising are provided by their respective third parties. We may update, limit or discontinue the tool. You are responsible for interpreting results and deciding on DNS changes. Report errors through the contact page.