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  • MonitoringCertificate & Domain MonitorDaily checks of TLS certificates, domain registration and DNS, with alerts when a renewal fails.
  • AssessmentSecurity AssessmentA passive security report for a domain you own: TLS, DNS, email authentication, headers and registration.
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Log inStart free
  • MonitoringCertificate & Domain MonitorDaily checks of TLS certificates, domain registration and DNS, with alerts when a renewal fails.
  • AssessmentSecurity AssessmentA passive security report for a domain you own: TLS, DNS, email authentication, headers and registration.
Free tools
Start hereDomain Health Check
Domain
  • Bulk Domain Expiry Checker
  • RDAP Domain Lookup
  • WHOIS Lookup
SSL / TLS
  • SSL Certificate Checker
  • Bulk SSL Expiry Checker
  • 47-Day Certificate Lifetime Calculator
  • Certificate Lifetime Readiness
  • Post-Quantum TLS Checker
DNS
  • DNS Lookup
  • MX Lookup
  • CAA Record Checker
  • DNS Propagation Checker
  • TXT Record Lookup
  • NS Lookup
  • CNAME Lookup
  • Reverse DNS Lookup
Email authentication
  • SPF Record Checker
  • SPF Record Generator
  • DMARC Record Checker
  • DMARC Record Generator
  • DKIM Record Checker
  • Email Sender Requirements Checker
Website security
  • Security Headers Checker
Network & IP
  • What Is My IP Address
  • Subnet Calculator
All free tools →
PricingDocsGuides
Start freeLog in
Security assessment

A security report for a domain you own

Verify that you control the domain, confirm the scope, and get every finding with its severity, its business impact and the steps to fix it. Read-only checks, the same requests any visitor or mail server makes.

Start freeOpen assessments
What it checks

Nine passive checks, one report

TLS certificate

Trust chain, expiry, hostname match, revocation, key size and signature algorithm.

DNS and CAA

Records, nameserver redundancy, CNAME conflicts, and which certificate authorities may issue for the domain.

Email authentication

MX, SPF (including the lookup limit), DKIM keys and the DMARC policy that stops spoofing in your name.

HTTP security headers

HTTPS redirect, HSTS, Content-Security-Policy, clickjacking protection and headers that reveal software versions.

Domain registration

Registration expiry from the registry, so a lapsed domain does not take the site and email down together.

Severity and fixes

Each finding is rated Critical to Informational, explained in plain language, with fix steps and references (CWE, RFC, OWASP).

How it works

Ownership first, then the assessment

What it does not do

This is a passive assessment, not a penetration test. It does not scan ports, probe for vulnerabilities or attempt exploitation, and it only runs against domains you have verified.

  1. 1Add the hostname you want assessed.
  2. 2Prove you control it with a DNS TXT record, an HTML meta tag or a file. We check it again before every run.
  3. 3Confirm the scope and the assessment terms. The confirmation is recorded.
  4. 4Run the assessment and watch each check finish.

Included in Pro

Pro includes one full assessment report a month, plus a free retest within 30 days to confirm your fixes. Not on Pro? Buy a single report for $29. On the Free plan you can verify a domain and see its score.

See pricing

Assess your own domain

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