Security Tools
Free, instant validators for email authentication, DNS, TLS and web security. Public data only.
SPF Record Checker
Check whether a domain publishes a valid SPF record and enforces it.
DKIM Checker
Detect whether a domain publishes DKIM keys on common selectors.
DMARC Checker
Check a domain's DMARC record and enforcement policy.
DNSSEC Checker
Check whether a domain is DNSSEC-signed.
TLS / Certificate Checker
Check a site's TLS version, certificate issuer and expiry.
Security Headers Checker
Check which HTTP security headers a site sends.
Email Reputation Checker
Check whether a domain's mail server appears on common blocklists.
Password Breach Checker
Check whether a password has appeared in known breaches — hashed locally, never stored.
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