DMARC lookup
Reads the e-mail security DNS records of a domain: SPF, DMARC, DKIM and MX. Domains without SPF and DMARC can be spoofed for phishing.
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Other tools
SSL check
TLS certificate, validity, cipher.
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.