DNS Deep Dive: free analysis of a domain's DNS records
DNS Deep Dive is a free online tool that analyzes the DNS configuration of any domain in real time: A, AAAA, MX, NS, TXT, CNAME and SOA records, plus the SPF, DMARC and DKIM email security policies. In seconds you get a security score and a clear list of issues and recommendations.
What DNS analysis is for
Checking DNS configuration is essential for email deliverability, to prevent domain spoofing and to diagnose reachability problems. System administrators, web agencies and site owners use DNS analysis to confirm that SPF and DMARC are set up correctly, that the TTL is appropriate and that the domain is IPv6-ready.
How DNS Deep Dive works
Enter a domain name and the tool queries the public name servers, retrieves every relevant record, analyzes the SPF by counting DNS lookups, evaluates the DMARC policy and probes the most common DKIM selectors. Each issue found is rated by severity (critical, warning, info) with an explanation and a fix.
100% free tool: 3 analyses per day with no sign-up, 50 per session with a free account. No installation, no credit card.