DNS Checkers & Tools

The "diagnostic" tools for your DNS. This section covers the "magic" tools every admin uses—like , , and online checkers (like dmarcian or mxtoolbox)—to see your public DNS records just as a receiving server would.

16 questions in this topic

What online tools can I use to check my MX records? What tools check SPF records? What tools check DKIM records? What tools check DMARC records? What tools check PTR records? How do you test DNS propagation? What’s the difference between online testers and command-line tools? How to use dig, nslookup, or host for DNS testing? How do you verify all authentication records (SPF, DKIM, DMARC, BIMI)? How do you read DNS query results accurately? How to troubleshoot SPF “permerror” or “temperror”? How to identify TXT record conflicts? How to debug DKIM signature fails? How to identify DNS caching delays? What are the most common misconfigurations seen in deliverability audits? How to monitor DNS changes over time?

Questions about DNS Checkers & Tools