Website checkup
Diagnostic tools
One domain, one click: DNS, hosting, SSL, email, headers and WordPress, checked from the outside the way visitors and mail servers see them. Run the full checkup below, or open any tool on its own.
We check from the outside, the way visitors see your site, and keep a simple log of sites checked. Privacy policy.
Every tool
Run one check on its own
Each tool goes deeper than the checkup, with its own options, the raw data and a link you can send to your host.
- Who hosts this website? Find the web host, CDN, DNS provider, email provider and platform behind any site.
- DNS inspector Every DNS record with TTLs, reverse DNS, network owners, nameserver health and a propagation view.
- Email authentication checker Check MX, SPF (with lookup counting), DMARC, DKIM, MTA-STS, TLS-RPT and BIMI.
- SSL/TLS inspector Certificate details, the full chain, hostname match, TLS versions, HSTS and CAA.
- HTTP and headers inspector Redirect chain, timing, HTTP version, compression, caching and graded security headers.
- WordPress overview WordPress version and whether it is current, the theme, visible plugins and PHP support status.
- Open port check See which common services (FTP, SSH, databases and more) answer from the internet.
- Speed test Google PageSpeed Insights with real visitor data, lab metrics and the biggest fixes.
- Domain registration lookup Registrar, expiry date, status codes explained, nameservers and DNSSEC from RDAP.
- Subdomain finder Subdomains found in public certificate logs, with which ones are live.
- IP and reverse DNS lookup Reverse DNS, forward confirmation, network owner and CDN detection for an IP or hostname.
- Email blocklist check Check your mail servers and website address against public email blocklists, with removal links.
- Can Google index this page? Status codes, robots.txt rules for Googlebot, noindex tags and headers, canonical and sitemap for one page.
- Mixed content scan Find http:// images, scripts, styles and forms that break the padlock on an https page.
- Email header analyzer Paste raw email headers to read SPF, DKIM, DMARC, the delivery path and delays. Runs in your browser only.
- Social preview check See the title, description and image Facebook, LinkedIn and X will show, and what to fix.
- On-page check One page checked for title, description, headings, skip link, alt text, buttons, form labels, link text, embedded frames, sharing tags, policy links, language and mobile set-up.
- Google Safe Browsing status Whether Google lists the site as unsafe (the red "Deceptive site ahead" warning), with a link to Google's own status page.
Know the limits
What this check cannot see
Every check runs from the outside, like a visitor or a mail server would. It cannot see inside WordPress, read your error logs, look at files on the server or tell whether you were hacked. A clean report means the public side looks right. If something is still wrong, open the Emergency Room and pick the symptom you see.