Kastro Lookup
Lookup-only Kastro Labs utility for WHOIS, DNS, TLS, mail authentication, GeoIP, ASN, reverse DNS, and routing context
Formerly who.andri.is, the project is now Kastro Lookup and lives at lookup.kastro.is. It is a practical, lookup-only Kastro Labs utility for understanding the public infrastructure signals attached to a domain or IP address.
Smart input detection runs WHOIS, DNS, SSL/TLS, GeoIP, ASN, reverse-DNS, and mail-authentication lookups covering SPF, DKIM, DMARC, MTA-STS, and related records. DNSSEC, propagation, and traceroute context are included when the current backend supports them.
The utility deliberately does not scan targets, require accounts, or load analytics and tracking beacons. Results are presented as practical context rather than offensive reconnaissance.
Built with Next.js 16, React 19, TypeScript, Tailwind CSS 4, Three.js, and React Three Fiber, and self-hosted under the kastro.is domain.