DNS Doctor
Free DNS diagnostic tool — scans SPF, DMARC, DKIM, MX, blacklists, and expiry, then prescribes the exact DNS record to fix issues.
| What is it | Free DNS diagnostic tool — scans SPF, DMARC, DKIM, MX, blacklists, and expiry, then prescribes the exact DNS record to fix issues. |
|---|---|
| Pricing | Freemium — from $12/mo |
| Free tier | Yes |
| Platform | Web Application |
| API | Yes |
| Works with | n8n |
| Best for | Diagnosing email deliverability issues (SPF, DMARC, DKIM failures), Checking domain and SSL certificate expiry before they break services |
| Domain registered | 2026 |
Data updated Sept. 19, 2026
What does DNS Doctor do?
DNS Doctor is a free diagnostic tool that checks your domain's DNS health in one scan. It examines SPF, DMARC, DKIM, MX records, blacklist status, DNSSEC, and domain/SSL expiry. Paste a domain, and you get a clear diagnosis of what's misconfigured or at risk, plus the exact DNS record to paste to fix each issue. No signup or payment required.
Key features
What makes it stand outWho is DNS Doctor for?
Who benefits most from this toolPricing
Free tier available — start without a credit cardScanner
- Full scan: SPF, DMARC, DKIM, MX, blacklist, domain & SSL expiry
- Health grade + plain-English explanation of every finding
- Copy-paste fix records, generated deterministically
- Shareable report page per domain
Monitor
- 10 domains
- 12 history months
- 10 domains · no per-message metering · 12-month history
- Every alert: record changes, verdict regressions, new sending sources, blacklist listings
- Expiry warnings — domain at 30/14/7/1 days, SSL at 14/7/1
- DMARC report (RUA) dashboard — every sender, aligned or not
- Enforcement readiness: the next safe policy record, one step at a time
Trust & presence
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