vx-underground.org
Historical malware archive mirrored by vx-underground for research and preservation.
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osint.sh
OSINT.sh tool for checking historical WHOIS records and domain ownership changes.
webwhois.verisign.com
Verisign WHOIS lookup for checking domain registration records and registry information.
whoxy.com
WHOIS intelligence service for searching domain ownership, history, and registrar data.
zoomeye.org
Cyberspace search engine for finding internet-connected assets, devices, and exposed services.