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DNS, TLS SANs, crt.sh, C99 fallback, robots/sitemap, headers, RDAP, common ports.

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DNS records TLS / SANs crt.sh subdomains robots + sitemap paths HTTP headers RDAP / WHOIS Common ports C99.nl subdomain fallback

Public hosts only. Paths come from robots.txt and sitemap.xml (published folders), not a directory brute-forcer. Ports are a short common list with a short timeout. C99 uses published scan pages, and the official API if you set c99_api_key.