SSL check
Checks the TLS certificate of a domain: issuer, remaining validity, TLS version, cipher suite and subject alternative names (SAN). Detects expired or soon-to-expire certificates and outdated protocols like TLS 1.0 or 1.1.
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Other tools
DMARC lookup
SPF, DMARC, DKIM and MX records.
HTTP headers
HSTS, CSP, X-Frame-Options & co.
DNS lookup
A, AAAA, MX, NS, TXT, CAA, SOA.
Whois / RDAP
Registrar, expiry, status, name servers.
Port scan
20 common TCP ports, critical ones flagged.
Cookie audit
Set-Cookie headers, flags, tracker detection.