Domain Health Check: DNS, WHOIS, SSL, HTTP, Robots and Sitemap Audit
Run a complete domain health snapshot from one input: DNS records, WHOIS availability, SSL expiry, HTTP status, robots.txt sitemap discovery and practical risk notes for admins and SEO work.
What domain health means
Domain health is the combination of several small technical signals. DNS must resolve, the website should answer with a healthy status, HTTPS should be valid, robots.txt should not hide important URLs and the sitemap should expose content clearly. A single weak signal may not break a site, but combined weaknesses create crawl, trust and reliability problems.
When to use this tool
- Before launching a new project or migration.
- After DNS, hosting, CDN or SSL changes.
- When a site suddenly disappears from search results.
- Before deep SEO work, so technical basics are not in doubt.
How to act on the audit
Treat the score as a triage helper. Fix hard blockers first: DNS failure, expired SSL, server errors and missing crawl discovery. Then refine security headers, performance, structured data and internal linking.
Frequently asked questions
What does a domain health check include?
DNS records (A, AAAA, MX, NS, TXT), SSL certificate validity and expiry date, the three email-authentication records SPF, DKIM and DMARC, and basic HTTP/HTTPS reachability. Together they cover whether the domain resolves, secures traffic and sends trustworthy mail.
How do I improve my domain health?
Add a correct SPF record and a DMARC policy, publish DKIM for your mail provider, renew the SSL certificate well before expiry, enable HTTPS with HSTS, and keep NS and MX records consistent across providers.
Why does my domain fail SPF or DMARC?
Usually a missing or malformed TXT record. SPF must list every service that sends your mail and end with a policy such as ~all. DMARC needs a p= policy and alignment with SPF or DKIM; a published but p=none record reports but does not enforce.
Does domain health affect email deliverability?
Strongly. Mailbox providers check SPF, DKIM and DMARC plus domain reputation before deciding inbox versus spam. A domain that fails authentication is far more likely to be filtered or rejected.
How often should I run a domain health check?
Monthly for an active domain, and always before SSL certificate and domain registration renewals so an expiry never takes a site or its mail offline.
