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KASTRO TOOLS

Kastro Lookup

Inspect the public signals your domain already gives away: DNS, mail authentication, TLS, WHOIS, routing, and basic internet hygiene.

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what it should help answer

Which DNS records are public and who controls them?
Do SPF, DKIM, DMARC, MTA-STS, and related mail-auth signals look sane?
What do TLS certificates, DNSSEC, WHOIS, ASN, and routing hints reveal?
Where should a domain owner fix hygiene before buying more tools?