Tool
DNS lookup
A, AAAA, MX, TXT, SPF, DKIM, DMARC, CAA — in one shot.
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Header check
Security header analysis: HSTS, CSP, COOP, COEP, Referrer-Policy.
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Breach lookup
Check an email or domain against known breach corpora.
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TLS grader
Inspect protocol, cipher, key exchange, and chain.
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Port scanner
TCP/UDP probe for the common 1024 ports. Polite rate.
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WHOIS lookup
Registrar, age, contacts, nameservers — bulk-friendly.
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